1. Ebay self sales.|
2. Ebay consignment sales (PWCC would be my first choice for large, expensive collections.)
3. Bill Goodwin Auctions. He probably won't buy your cards, but he may charge a seller fee to sell. However, he also charges a 19% buyer's premium, so you might be able to negotiate a low or no seller's fee.
#1 in 1959 Topps. Officially known as Assassin according to stanthemanfan 3/31/2014 and god of minor league basketball according to cammb.