
OP I think you might be interested in my workplace! My university has the only pop culture degree in the country, and we’re home to the largest archive of pop culture materials in the world! We have a ton of rare/obscure Spider-Man stuff, and we even had a conference a few years back! :)
So many places to count ong. Most of it I got secondhand through thrift store, FB Marketplace, flea markets, etc or it was gifted to me. Other stuff I mainly found at Walmart or hobby lobby and I got a couple things from Amazon like the rug and a lot of my collectibles on my shelf.