Amazon is deliberately built to be terrible for the users, so they can push products that make them the most money. Most filters are useless, and some don’t work properly, you only have limited sorting options that also don’t work properly (if you sort ascending by price, it will still put sponsored results that don’t respect the sorting order). A while ago, I was looking for a product that I knew should cost about €5, and I couldn’t find any cheaper than €10 until I got to the 10th result page.

For an example of a good search interface, just check farnell.com. It’s insanely good, you can basically filter by any attribute of a product. Being able to use something like this to search for a laptop, or a mobile phone would be amazing.