From the Super Mario Wiki, the Mario encyclopedia
Prisma Cardware (referred to as the Card Shop in the online manual) is a Battle Card shop in Paper Mario: Color Splash. It can be found in the blue district of Port Prisma. The shop is opened after Mario repaints the owner, a blue Toad. As the player progresses in the game, more cards become available. A red Toad appears outside of the shop, and tells Mario whenever a new card is available. Painted cards and non-painted cards are sold at Prisma Cardware, the former of which costs more coins.
^ indicates unpainted.