http://premierauctionsonline.com is a sports autograph auction house of reasonable reputation and they have regular auctions. It originally was Mike Gutierrez Auctions, but Gutierrez went to Heritage and his workers took over (with Gutierrez's approval) and changed the name. They have lots of more affordable lots, including stuff like your collection. I bought from them a few times and had no troubles with money or shipping or anything like that.