Yes, they do have refillable mugs. They were about $10 each, and they can be refilled at 4 places at HH I learned this past trip. We could only think of three (Surfman's, Signals, Tide me Over), but asked and learned the fourth. Anyone out there know the fourth place, I thought it was a great trivia question. My 3 kids could not wait to get theirs again in April, and after we checked in at 8:45 AM we went straight to the snack bar and purchased them. As my DD (6) stated at the time "Let the fountains start flowing!"