Can someone please tell me if there is a list of user shops?

Or please tell me how to find the user shop with the most items 2k and under?

There's not an easy way, unfortunately.

If I'm looking for cheap stuff for fragging though, I usually start with an item I've found through questing or something that's within the price range I'm looking at, and then I go into those users' shops and skim the page for other items under that price threshold. If you're specifically looking for under 2k, you could open a shop and Ctrl+F for 1, and that would catch items priced between 1,000 and 2,000 (and probably some false positives). It's not exactly user friendly, but that would be the only way I know of besides maybe posting in the Wanted forum for items under whatever price

You can also run a search on SubetaLodge based on user shop price. You need to check often though, because the cheap items don't stay for long. Its also best to search for rarity 1-199 because CWs can often be priced very weirdly and give a lot of false positives.

If you have a GA you can look in your own shops and see which items are priced lowest. Open up a Shop Search on about ten of them and you will often be able to find some shopnames that are always there. These are the users who either just priced their shops or who stay on top of their prices always. Go to those shops and you will usually find multiple items cheapest. Like others who posted above, you will have to look for them.

If you know a shop that belongs to someone in your experience that sells cheapy stuff, you can either write down their shopname or their username and you can re-Find it later.