I used browser extension Distill in the past, it’s pretty easy to use and it works well for detecting/tracking changes of the specific elements on the page. I think free version allows 25 local monitors.

I also just found this extension Automa, I’ve never used it, but it seems cool. Looks like a Tasker for your browser. And there are also a workflows that people share, I saw this one randomly, Scrap Google Suggest to SpreadSheet so I guess you could do a similar thing for prices.

That was my next question :D, thank you both.

Vivaldi, for it’s customization and all the additional features, like RSS feed reader, Email client, Notes, Calendar, Reminders, Alarm, Translator…

I get that most people just want to be able to use the browser to surf the web, but I like everything that it offers, and I use majority of it’s features.