If you want to chew gum while on your Disney vacation, you will need to bring your own with you. Gum is not sold in any store at Walt Disney World, including the candy stores. Gum is hard to clean up after, and too many people have no problem with dropping a piece on the ground when they are done with it. It is easier to not sell gum and cut down on how much gets spit out than it is to try to clean up after inconsiderate guests. If you do decide to bring gum into a park with you, please make sure that you dispose of it properly. If you forgot to bring some and ask a Cast Member where to buy it, don't be rude when they tell you that it is not available.