diff --git a/PriceChecker.Core/Services/TrickyHttpClient.cs b/PriceChecker.Core/Services/TrickyHttpClient.cs
index 77141cc..18de2f2 100644
--- a/PriceChecker.Core/Services/TrickyHttpClient.cs
+++ b/PriceChecker.Core/Services/TrickyHttpClient.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Concurrent;
+using System.Net;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -16,7 +17,7 @@ public class TrickyHttpClient : ITrickyHttpClient
     {
         private readonly ConcurrentDictionary<string, SemaphoreSlim> _lockers = new();
         private readonly ILogger<TrickyHttpClient> _logger;
-        private static object _locker = new object();
+        private static object _locker = new();
 
         private const int DELAY_MS = 500;
 
@@ -44,12 +45,18 @@ public async Task<string> DownloadContent(string url)
 
         private async Task<string> DownloadInternal(string url)
         {
-            var httpClient = new HttpClient();
+            var handler = new HttpClientHandler()
+            {
+                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
+            };
+            var httpClient = new HttpClient(handler);
 
             // To confuse the hosts
             httpClient.DefaultRequestHeaders.Add("X-Cookies-Accepted", "1");
-            httpClient.DefaultRequestHeaders.Add("accept", "text/html");
-            httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
+            httpClient.DefaultRequestHeaders.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9");
+            httpClient.DefaultRequestHeaders.Add("Accept-Language", "en-US,en;q=0.9");
+            httpClient.DefaultRequestHeaders.Add("Accept-Encoding", "gzip, deflate");
+            httpClient.DefaultRequestHeaders.Add("User-Agent", CreateRandomUserAgent());
 
             var response = await httpClient.GetAsync(url);
             if (!response.IsSuccessStatusCode)
@@ -60,5 +67,53 @@ private async Task<string> DownloadInternal(string url)
             }
             return await response.Content.ReadAsStringAsync();
         }
+
+        private string CreateRandomUserAgent()
+        {
+            var platform = new [] { "Machintosh", "Windows", "X11" }.TakeRandom();
+            var os = (platform switch {
+                "Machintosh" => new [] { "68K", "PPC" },
+                "Windows" => new [] { "Win3.11", "WinNT3.51", "WinNT4.0", "Windows NT 5.0", "Windows NT 5.1", "Windows NT 5.2", "Windows NT 6.0", "Windows NT 6.1", "Windows NT 6.2", "Win95", "Win98", "Win 9x 4.90", "WindowsCE" },
+                "X11" => new [] { "Linux i686", "Linux x86_64" },
+                _ => new string[] {}
+            }).TakeRandom();
+            var browser = new [] { "Chrome", "Firefox", "IE" }.TakeRandom();
+
+            if (browser == "Chrome")
+            {
+			    var webkit = Utils.RandomInt(500, 599).ToString();
+			    var version = $"{Utils.RandomInt(0, 24)}.0{Utils.RandomInt(0, 1500)}.{Utils.RandomInt(0, 999)}";
+
+			    return $"Mozilla/5.0 ({os}) AppleWebKit{webkit}.0 (KHTML, live Gecko) Chrome/{version} Safari/{webkit}";
+            }
+            if (browser == "Firefox")
+            {
+                var year = Utils.RandomInt(2000, 2021);
+                var month = Utils.RandomInt(1, 12);
+                var day = Utils.RandomInt(1, 28);
+                var gecko = $"{year}{month:00}{day:00}";
+                var version = $"{Utils.RandomInt(1, 15)}.0";
+
+                return $"Mozillia/5.0 ({os}; rv:{version}) Gecko/{gecko} Firefox/{version}";
+            }
+            if (browser == "IE")
+            {
+                var version = $"{Utils.RandomInt(1, 10)}.0";
+                var engine = $"{Utils.RandomInt(1, 5)}.0";
+                var option = Utils.RandomBool();
+                string token;
+                if (option)
+                {
+                    var v = new [] { ".NET CLR", "SV1", "Tablet PC", "Win64; IA64", "Win64; x64", "WOW64" }.TakeRandom();
+                    token = $"{v};";
+                }
+                else
+                    token = "";
+
+                return $"Mozilla/5.0 (compatible; MSIE {version}; {os}; {token}Trident/{engine})";
+            }
+
+            throw new NotImplementedException();
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/PriceChecker.Core/Utils.cs b/PriceChecker.Core/Utils.cs
new file mode 100644
index 0000000..4acfb74
--- /dev/null
+++ b/PriceChecker.Core/Utils.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+
+namespace Genius.PriceChecker.Core
+{
+    public static class Utils
+    {
+        private static Random _rnd = new();
+
+        public static bool RandomBool()
+            => _rnd.NextDouble() >= 0.5;
+
+        public static int RandomInt(int from, int to)
+            => _rnd.Next(from, to);
+
+        public static T TakeRandom<T>(this IList<T> list)
+        {
+            if (list.Count == 0)
+                return default (T);
+            return list[_rnd.Next(0, list.Count - 1)];
+        }
+    }
+}
\ No newline at end of file
diff --git a/PriceChecker.UI/ViewModels/TrackerProductViewModel.cs b/PriceChecker.UI/ViewModels/TrackerProductViewModel.cs
index 01a87d0..8bbcd13 100644
--- a/PriceChecker.UI/ViewModels/TrackerProductViewModel.cs
+++ b/PriceChecker.UI/ViewModels/TrackerProductViewModel.cs
@@ -163,7 +163,9 @@ private void CommitProduct()
 
         private TrackerProductSourceViewModel CreateSourceViewModel(ProductSource productSource)
         {
-            var lastPrice = _product?.Recent?.FirstOrDefault(x => x.ProductSourceId == productSource.Id)?.Price;
+            var lastPrice = productSource == null || _product?.Recent == null
+                ? null
+                : _product.Recent.FirstOrDefault(x => x.ProductSourceId == productSource.Id)?.Price;
             var vm = new TrackerProductSourceViewModel(_ui, productSource, lastPrice);
             vm.DeleteCommand.Executed += (_, __) => {
                 Sources.Remove(vm);
diff --git a/README.md b/README.md
index 0522107..dcaeb5f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,11 @@
 # price-checker
 A simple price checker for the selected products to catch the cheapest deal
+
+### Main window:
+![Main window](docs/assets/MainWindow.png)
+
+### Product edit:
+![Product edit](docs/assets/ProductEdit.png)
+
+### Product with updated lowest price:
+![Product with updated lowest price](docs/assets/ProductWithUpdatedLowestPrice.png)
diff --git a/agents.json b/agents.json
index 4bb82ba..44c545c 100644
--- a/agents.json
+++ b/agents.json
@@ -40,11 +40,5 @@
     "Url": "https://www.viofo.nl/en/collections/viofo-dashcams/products/{0}",
     "PricePattern": "\u0022og:price:amount\u0022 content=\u0022(?\u003Cprice\u003E[\\d,]\u002B)\u0022\u003E",
     "DecimalDelimiter": ","
-  },
-  {
-    "Id": "t1",
-    "Url": "t2",
-    "PricePattern": "t3",
-    "DecimalDelimiter": "."
   }
 ]
\ No newline at end of file
diff --git a/docs/assets/MainWindow.png b/docs/assets/MainWindow.png
new file mode 100644
index 0000000..5271811
Binary files /dev/null and b/docs/assets/MainWindow.png differ
diff --git a/docs/assets/ProductEdit.png b/docs/assets/ProductEdit.png
new file mode 100644
index 0000000..2f5913d
Binary files /dev/null and b/docs/assets/ProductEdit.png differ
diff --git a/docs/assets/ProductWithUpdatedLowestPrice.png b/docs/assets/ProductWithUpdatedLowestPrice.png
new file mode 100644
index 0000000..c0aaecb
Binary files /dev/null and b/docs/assets/ProductWithUpdatedLowestPrice.png differ
diff --git a/products.json b/products.json
index 1104445..fe0ba03 100644
--- a/products.json
+++ b/products.json
@@ -13,14 +13,14 @@
     ],
     "Lowest": {
       "ProductSourceId": "60b9ceed-b34c-45ad-a142-af0ec5491d91",
-      "Price": 22.90,
-      "FoundDate": "2021-06-08T10:05:07.2366544+02:00"
+      "Price": 21.50,
+      "FoundDate": "2021-06-09T11:37:07.6430411+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "60b9ceed-b34c-45ad-a142-af0ec5491d91",
-        "Price": 22.90,
-        "FoundDate": "2021-06-08T10:05:07.2366544+02:00"
+        "Price": 21.50,
+        "FoundDate": "2021-06-09T11:37:07.6430411+02:00"
       }
     ]
   },
@@ -48,14 +48,14 @@
     },
     "Recent": [
       {
-        "ProductSourceId": "4753f887-5b20-41de-a06b-3c159262a273",
-        "Price": 799,
-        "FoundDate": "2021-06-08T10:06:20.3313322+02:00"
+        "ProductSourceId": "ebeaa98d-aedb-4bb8-b539-1de7e1ee25cc",
+        "Price": 779,
+        "FoundDate": "2021-06-09T11:37:06.9271835+02:00"
       },
       {
-        "ProductSourceId": "ebeaa98d-aedb-4bb8-b539-1de7e1ee25cc",
-        "Price": 756,
-        "FoundDate": "2021-06-08T10:06:20.3313476+02:00"
+        "ProductSourceId": "4753f887-5b20-41de-a06b-3c159262a273",
+        "Price": 799,
+        "FoundDate": "2021-06-09T11:37:06.9271872+02:00"
       }
     ]
   },
@@ -84,23 +84,23 @@
     "Lowest": {
       "ProductSourceId": "59b2149f-9148-40eb-88c3-16061247487f",
       "Price": 659.99,
-      "FoundDate": "2021-06-08T10:06:38.7756063+02:00"
+      "FoundDate": "2021-06-09T11:37:18.9777833+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "59b2149f-9148-40eb-88c3-16061247487f",
         "Price": 659.99,
-        "FoundDate": "2021-06-08T10:06:38.7756063+02:00"
+        "FoundDate": "2021-06-09T11:37:18.9777833+02:00"
       },
       {
         "ProductSourceId": "190b93f8-d428-4b9b-aa70-127c513d352f",
         "Price": 699,
-        "FoundDate": "2021-06-08T10:06:38.7756111+02:00"
+        "FoundDate": "2021-06-09T11:37:18.9777865+02:00"
       },
       {
         "ProductSourceId": "7abd51a9-7ba1-4b72-9ff3-3fb89fce9045",
         "Price": 729.00,
-        "FoundDate": "2021-06-08T10:06:38.775613+02:00"
+        "FoundDate": "2021-06-09T11:37:18.9777868+02:00"
       }
     ]
   },
@@ -129,23 +129,23 @@
     "Lowest": {
       "ProductSourceId": "3b27b7fc-369d-4f90-ba4c-f209c1a0153b",
       "Price": 165.95,
-      "FoundDate": "2021-06-08T10:06:25.8162775+02:00"
+      "FoundDate": "2021-06-09T11:37:11.7831872+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "d786a796-b93c-468b-8fda-a2892d72802a",
         "Price": 179.0,
-        "FoundDate": "2021-06-08T10:06:25.8162724+02:00"
-      },
-      {
-        "ProductSourceId": "1778e5f5-b73d-418b-b3b8-06412828f54f",
-        "Price": 169.00,
-        "FoundDate": "2021-06-08T10:06:25.816277+02:00"
+        "FoundDate": "2021-06-09T11:37:11.7831838+02:00"
       },
       {
         "ProductSourceId": "3b27b7fc-369d-4f90-ba4c-f209c1a0153b",
         "Price": 165.95,
-        "FoundDate": "2021-06-08T10:06:25.8162775+02:00"
+        "FoundDate": "2021-06-09T11:37:11.7831872+02:00"
+      },
+      {
+        "ProductSourceId": "1778e5f5-b73d-418b-b3b8-06412828f54f",
+        "Price": 168.00,
+        "FoundDate": "2021-06-09T11:37:11.7831876+02:00"
       }
     ]
   },
@@ -168,19 +168,19 @@
     ],
     "Lowest": {
       "ProductSourceId": "923b83ed-3fcb-43ca-80b0-0e9e717ec9c6",
-      "Price": 429.9,
-      "FoundDate": "2021-06-08T10:06:27.8310704+02:00"
+      "Price": 429.0,
+      "FoundDate": "2021-06-09T11:37:13.8349092+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "923b83ed-3fcb-43ca-80b0-0e9e717ec9c6",
-        "Price": 429.9,
-        "FoundDate": "2021-06-08T10:06:27.8310704+02:00"
+        "Price": 429.0,
+        "FoundDate": "2021-06-09T11:37:13.8349092+02:00"
       },
       {
         "ProductSourceId": "5f5a72a4-d6ad-4cab-9fb9-9d5839fa2a03",
         "Price": 449.95,
-        "FoundDate": "2021-06-08T10:06:27.8310749+02:00"
+        "FoundDate": "2021-06-09T11:37:13.8349127+02:00"
       }
     ]
   },
@@ -204,18 +204,18 @@
     "Lowest": {
       "ProductSourceId": "62dcd317-1805-4b07-bb30-81045d4a6517",
       "Price": 179.95,
-      "FoundDate": "2021-06-08T10:04:47.5658818+02:00"
+      "FoundDate": "2021-06-09T11:37:08.9364614+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "62dcd317-1805-4b07-bb30-81045d4a6517",
         "Price": 179.95,
-        "FoundDate": "2021-06-08T10:04:47.5658818+02:00"
+        "FoundDate": "2021-06-09T11:37:08.9364614+02:00"
       },
       {
         "ProductSourceId": "76ba5029-6cf6-4231-bc99-ca7d65cde50d",
         "Price": 189.95,
-        "FoundDate": "2021-06-08T10:04:47.5658958+02:00"
+        "FoundDate": "2021-06-09T11:37:08.9364653+02:00"
       }
     ]
   },
@@ -245,12 +245,7 @@
       {
         "ProductSourceId": "cbb43572-35b9-4408-9e52-09f934b97336",
         "Price": 589.55,
-        "FoundDate": "2021-06-04T18:57:59.3983603+02:00"
-      },
-      {
-        "ProductSourceId": "ab80a6f9-c175-4c10-8f69-aee23e7efc64",
-        "Price": 442.47,
-        "FoundDate": "2021-06-04T18:57:59.398364+02:00"
+        "FoundDate": "2021-06-08T15:46:18.7308128+02:00"
       }
     ]
   },
@@ -264,6 +259,11 @@
         "Id": "aa039437-a86f-4cf7-9283-90c63a95e142",
         "AgentId": "amazon.de",
         "AgentArgument": "B01K4CYV58"
+      },
+      {
+        "Id": "b129f9f2-416b-493e-af3c-ff0f255a66e9",
+        "AgentId": "tweakers.net",
+        "AgentArgument": "580883/garmin-virb-ultra-30-rood-zwart.html"
       }
     ],
     "Lowest": {
@@ -273,9 +273,9 @@
     },
     "Recent": [
       {
-        "ProductSourceId": "aa039437-a86f-4cf7-9283-90c63a95e142",
-        "Price": 389.95,
-        "FoundDate": "2021-06-04T16:23:06.2236865+02:00"
+        "ProductSourceId": "b129f9f2-416b-493e-af3c-ff0f255a66e9",
+        "Price": 499.99,
+        "FoundDate": "2021-06-09T11:42:53.9223031+02:00"
       }
     ]
   },
@@ -294,13 +294,13 @@
     "Lowest": {
       "ProductSourceId": "831217bc-0784-4d57-a6a5-d71bf6b2bd19",
       "Price": 236.80,
-      "FoundDate": "2021-06-04T16:36:05.7758763+02:00"
+      "FoundDate": "2021-06-08T15:46:18.4488366+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "831217bc-0784-4d57-a6a5-d71bf6b2bd19",
         "Price": 236.80,
-        "FoundDate": "2021-06-04T16:36:05.7758763+02:00"
+        "FoundDate": "2021-06-08T15:46:18.4488366+02:00"
       }
     ]
   },
@@ -319,13 +319,13 @@
     "Lowest": {
       "ProductSourceId": "65f0f16f-a64c-4244-bd3b-ea58c27740ed",
       "Price": 349.99,
-      "FoundDate": "2021-06-08T10:12:50.4494975+02:00"
+      "FoundDate": "2021-06-08T15:46:18.1966565+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "65f0f16f-a64c-4244-bd3b-ea58c27740ed",
         "Price": 349.99,
-        "FoundDate": "2021-06-08T10:12:50.4494975+02:00"
+        "FoundDate": "2021-06-08T15:46:18.1966565+02:00"
       }
     ]
   },
@@ -349,8 +349,8 @@
     "Recent": [
       {
         "ProductSourceId": "c33f08c8-854e-4a60-8eff-bd900cffe134",
-        "Price": 279.99,
-        "FoundDate": "2021-06-04T18:18:42.7704614+02:00"
+        "Price": 349.0,
+        "FoundDate": "2021-06-08T15:46:22.6356321+02:00"
       }
     ]
   },
@@ -374,8 +374,8 @@
     "Recent": [
       {
         "ProductSourceId": "64f76755-0839-4c6c-9a7c-e28e4cf1e670",
-        "Price": 298.44,
-        "FoundDate": "2021-06-04T18:20:57.556876+02:00"
+        "Price": 299.99,
+        "FoundDate": "2021-06-08T15:46:24.7254817+02:00"
       }
     ]
   },
@@ -389,18 +389,28 @@
         "Id": "e4b4c4d2-d318-4304-af16-3b97a18509f7",
         "AgentId": "amazon.de",
         "AgentArgument": "B08G2HBBB6"
+      },
+      {
+        "Id": "05b5f419-0ace-4ba7-b35a-4eb571c5ecc6",
+        "AgentId": "tweakers.net",
+        "AgentArgument": "1611988/gopro-hero9-black-zwart.html"
       }
     ],
     "Lowest": {
       "ProductSourceId": "e4b4c4d2-d318-4304-af16-3b97a18509f7",
       "Price": 399.99,
-      "FoundDate": "2021-06-04T18:22:51.7624875+02:00"
+      "FoundDate": "2021-06-09T11:44:49.8138826+02:00"
     },
     "Recent": [
+      {
+        "ProductSourceId": "05b5f419-0ace-4ba7-b35a-4eb571c5ecc6",
+        "Price": 409,
+        "FoundDate": "2021-06-09T11:44:49.813879+02:00"
+      },
       {
         "ProductSourceId": "e4b4c4d2-d318-4304-af16-3b97a18509f7",
         "Price": 399.99,
-        "FoundDate": "2021-06-04T18:22:51.7624875+02:00"
+        "FoundDate": "2021-06-09T11:44:49.8138826+02:00"
       }
     ]
   },
@@ -419,13 +429,13 @@
     "Lowest": {
       "ProductSourceId": "e593c859-0dff-491d-a9ad-1a2f74a7f6f6",
       "Price": 258.99,
-      "FoundDate": "2021-06-04T18:24:14.2715873+02:00"
+      "FoundDate": "2021-06-08T15:46:28.6875693+02:00"
     },
     "Recent": [
       {
         "ProductSourceId": "e593c859-0dff-491d-a9ad-1a2f74a7f6f6",
         "Price": 258.99,
-        "FoundDate": "2021-06-04T18:24:14.2715873+02:00"
+        "FoundDate": "2021-06-08T15:46:28.6875693+02:00"
       }
     ]
   }