They have them at Downtown Disney in the big store (sorry, can't remember the name right now). Also, all the parks have at least one store with the beads. They are not Pandora, but they do fit the Pandora. I just came back last week and got two beads for me and they fit. Magic Kingdom has them at the jewelry shop on Main Street. Look for the store with the jewelry and they will be there! They have hundreds!!
Have fun!