Retail giants Target Corporation (NYSE:TGT) and Walmart Inc. (NYSE:WMT) are riding a massive boom in collectible trading cards, with Target projecting more than $1 billion in annual sales from the category.CNBC reports that analysts say the surge could keep the retailers ahead in the competitive holiday season.Sales of trading cards featuring Pokémon, athletes, and celebrities have jumped sharply in 2025, becoming one of the hottest toy categories. Target says trading card revenue has soared about 70% this ...