Sort/filter stores by number of items owned/unowned

If anybody is a collector of items like I am, sometimes you’ll be interested in seeing how many items you do not own. I think for stores like the Arcade ticket counter and the Ghoulcery store (or similar seasonal stores), it would be nice to see a way to sort or filter the list to see what items one doesn’t have easily.

This is a really good idea, can’t believe I never thought of it lol