Pricespy.co.uk - On Price Spy you type in the product you're looking to buy & it'll tell you how much its selling for at different stores, if you click on them it'll also tell you the price history of the product so you can make sure you're getting a good deal. Source: over 1 year ago

Also when it comes to Prisjakt it can be a bit tricky with the language. So what you do is use the English site - https://pricespy.co.uk/ - and find the item. Then change the webadress to prisjakt.no (keeping the rest of the URL intact) - hey presto, you get the list of Norwegian retailers (doesn't work well with white goods as model number differ so much, each retailer seems to get their own model number to help... Source: over 2 years ago

I edited my question with an example. This website : https://pricespy.co.uk/. How they can managed to scrap so many websites to give an accurate comparaison of price products? Source: over 2 years ago

Something along the lines of this: Https://embedsocial.com/. Source: over 1 year ago

Https://embedsocial.com/ is close. Not sure about the monthly grouping though. Source: over 2 years ago