They do sell them. I have one that holds 36 pennies and 6 quarters and cost $6. I got it at World of Disney at Downtown Disney Marketplace, but I've seen them at a lot of the shops at WDW, especially shops like the Emporium, MouseGears, or hotel gift shops. I think they're usually near the counted with the autograph books or with the souvenir-type things like key chains and photo albums.