WDW Trade Boxes
Magic Kingdom
Frontierland Trading Post
Main Street Emporium
Art of Disney Store(across from the Emporium) - 15 Mystery & 3 Clear Box
Merchants of Venus (Tomorrowland) - 15 Mystery
Epcot
Mouse Gear - 15 Mystery & 3 Clear Box
Disney Traders (World Showcase)- 15 Mystery & 3 Clear Box
Camera Center- 15 Mystery - unavailable as of 9/6/12
Mission Space
Guest Relations - 15 Mystery & 3 Clear Box - unavailable as of 9/6/12
Entrance to World Showcase (across from Duffy) - 15 Mystery & 3 Clear
United Kingdom Pavilion - 15 Mystery
Journey into Imagination - 15 Mystery & 3 Clear Box - unavailable as of 9/6/12[/s]
Hollywood Studios
Villains in Vogue - 15 Mystery & 3 Clear Box
Disney & Co. - 24 Mystery
Tower of Terror Gift Shop - 24 Mystery
Animation Store - 24 Mystery & sometimes 3 Clear Box
Muppets Store - 24 Mystery
Animal Kingdom
Island Mercantile - 15 Mystery & 3 Clear
Dinosaur Gift Shop - 24 Mystery & 3 Clear Box
Expedition Everest Gift Shop - 3 Clear
Downtown Disney
D-Street - 15 Mystery, 3 Clear, Juniors Clear
Pin Traders - 15 Mystery & 3 Clear
Art of Animation Store- 24 Mystery & 3 Clear Box
Once Upon a Toy - 15 Mystery & 3 Clear
World of Disney - 15 Mystery at Info Desk & also a 15 Mystery that is randomly put out in front of the Vinylmation display
Disney Quest - trading has been discontinued AGAIN as of 7/14/12
WDW Resorts
All of the WDW resorts, except Fort Wilderness, currently have trading in their main gift shops.
Orlando Disney Outlets
