Inside a packed San Antonio Shrine Auditorium during the last weekend of June, a multi-generational crowd of collectors gathered for the San Antonio Collectors Expo with a mission: to buy, sell and showcase their prized cardboard investments.  People of all ages swarmed the floor. Young kids dress ed in suits carried briefcases full of sports cards […] The post Cardboard Gold: San Antonio collectors fuel a booming sports card market appeared first on San Antonio Current. ...read more read less