For vinyl, check the used record stores. There are a few in Tulsa; One is near you at 68th and Memorial. You can sometimes find surprises in the Salvation Army and Goodwill thrift stores too. They usually have a bunch of junk, mostly records played on a nasty table and kept out of the sleeves. But one or two are gems, and sometimes you'll even find groups that way. They're worth checking every so often.