Pokémon cards are already way more expensive than MSRP at GameStop, but the retailer still isn't done squeezing out every possible dollar from the collector-market frenzy. Since last year, the video game retailer has been selling something called 'Power Packs,' which are small sets of cards compiled by GameStop itself. Earlier in April, GameStop followed that up by launching a digital version of Power Packs, which allows users to buy and trade digital versions of physical cards.