Mickey’s Mates is one of two shops on the Disney Wonder cruise ship. This store sells primarily items for children – toys, children’s clothing, princess outfits, trading pins etc The second store, Treasure Ketch has more adult appealing merchandise and sundries.
While you are onboard, you essentially don’t use cash, you use your room key to purchase all items and the total goes on your stateroom account. So, you might like to prevent onboard charges going onto your child’s room key. 🙂
Stores on the Disney Magic I believe are much the same (or at least they were last time I cruised on the Magic). The Disney Fantasy and the Disney Dream being larger ships, have much bigger stores so have a wider range of items available, but probably most of the items you see here would be available (excepting the destination specific items).