Greasy Fork

I need some help making a script that will auto check the prime checkbox on Amazon. The problem I am trying to solve is that after every search the prime is not selected so you need to check it manually every single time to make sure the results are filtered by prime. I know that I need to select element by id but I cannot find the id of that checkbox in the inspector. Any idea how to accomplish this? These sites like Amazon and eBay should have a settings per account where you could select these permanently but they are too lazy or maybe overlooked this problem. Thanks.

Any page example?

The issue is as I said that after every search for a product the results are prime and not prime mixed. If you are a prime customer and you are interested ONLY about items that are prime eligible then after every search you have to keep selecting that checkbox every time after the results are displayed and page loaded which makes the page reload but with the results filtered only by prime this time. I am sure that checkbox can be checked automatically with Java Script but it's been a long time since I was involved in scripting and programming and I forgot how to do many things. The same issue is on eBay after every search you have to redo the filtering and sorting every time. The solution could be simple if the website owners would make some sticky settings so the user can set his preferences like almost every app has a settings page...e.g. the user can set only products from US and free shipping and that remain set for the whole session for the user that is logged in. I hope I have explained clearly the intention and the problem. I attached a page screenshot so the issue can be hopefully better explained.