There are two stores, Mickey's Mates and Treasure Ketch. The latter is mostly adult clothing, toiletries, some art pieces, etc. Mickey's Mates has the kids stuff, some adult clothing, pins, toys, picture frames, etc.
Please keep in mind that the stores are only open at specific times. Their hours are regulated by some screwy laws that I don't understand. Rule of thumb: they won't be open while in port.