Take them to the thrift store?
Sports memorabilia is not going well right now. Earlier today, I had a buyer (and re seller apparently) come by about some hockey cards that I'm selling. There are over 2,200 cards from the 1970s to present day. A lot of commons, yeah, but there are some early Wayne Gretzky's and the like. Refractor cards and plenty of rookies. He offered me $5 for all of them. When I told him that really wasn't going to work he raised his offer to $10 for everything. Needless to say I still have them.