Sports cards are commonly known as trading cards, which are small cards made out of paper board or thick paper and usually contains an image of a certain person, place or thing with a short description of the image along with other text. Trading cards are traditionally associated with sports with baseball cards being especially well-known.
Sports memorabilia on the other hand, refers to anything that can be directly connected to a sports event or personality. It often refers to autographed sports items as well. These items are generally gathered by the fans of the particular sport, athlete or team that the item signifies or by collectors. In places like Oakland a memorabilia that looks back in time, could fetch a lot of price.