An unexpected store is present in the co-op area of Portal 2, where players can purchase items to customize Atlas and P-body, the pair of robot protagonists for the co-op campaign in Valve's just-launched puzzle sequel. You must have in-game access to the Steam community enabled in order to access the store, where you will be able to use real money to buy virtual customizations for the otherwise generic 'bots. And yes, hats are included.