At the four Theme Parks, the policy is: 
Large Locker: $7.00 per day plus a $5.00 key deposit which is refunded when the key is returned 
Small Locker: $5.00 per day plus a $5.00 key deposit which is refunded when the key is returned 
Key must be turned in within an hour of the park closing 
Key operated lockers can be accessed as often as you like 
When visiting more than one theme park on the same day: 
Return the key for the $5.00 deposit and get a receipt 
Take the receipt to the next theme park 
Present the receipt, pay the $5.00 key deposit and you'll have a locker for the remainder of the day 
Locker Locations
Magic Kingdom-
Inside the park adjacent to the Wheelchair/
ECV rental 
Small locker - 11"H x 9"W x 16" Deep 
Large locker - 17"H x 12"W x 22" Deep 
Epcot - 
To the right of the base of Spaceship Earth, near the restrooms 
International Gateway 
Small locker - 11"H x 9"W x 16" Deep 
Large locker - 17"H x 12"W x 22" Deep 
Disney Hollywood Studios - 
Rent at Crossroad's of the World - Lockers located next to Oscar's Super Service 
Small locker - 11"H x 9"W x 16" Deep 
Large locker - 17"H x 12"W x 22" Deep 
Disney Animal Kingdom - 
Expedition Storage lockers by Guest Services inside the park 
Small 11"H x 9"W x 16" Deep 
Large 17"H x 9"W x 16" Deep 
Outside the park near the Kennel (rent at Kennel) 
Small 11"H x 9"W x 16" Deep 
Large 17"H x 9"W x 16" Deep 
Extra Large 17"H x 12"W x 16" Deep 
There are Luggage Lockers at Epcot and at the Ticket and Transportation Center. The Epcot luggage lockers are located behind the bus information booth. The TTC lockers are located next to the bus information booth.These are coin operated and require 4 quarters each time they're used. The dimensions are: 23"H x 16"W x 29" Deep 
Pricing at the Water Parks:
Blizzard Beach
$5.00 rental per day for Small: 11"H x 9"W x 16" Deep plus a $5.00 key deposit which is refunded when the key is returned 
$7.00 rental per day for Large: 17"H x 9"W x 16" Deep plus a $5.00 key deposit which is refunded when the key is returned 
Typhoon Lagoon
$5.00 rental per day for Small: 12"H x 12" W x 16" Deep plus a $5.00 key deposit which is refunded when the key is returned 
$7.00 rental per day for Large: 18"H x 18"W x 16" Deep plus a $5.00 key deposit which is refunded when the key is returned 
Downtown Disney
Lockers at Downtown Disney are coin operated and require 4 quarters each time that they're opened. 
Marketplace:
Near Cap'n Jack's Restaurant and the Marina Rental Window 
Dimensions: 17"H x 9"W x 16" Deep 
Pleasure Island:
Opposite Motion Dance Club 
Mannequins second floor by the elevator 
8-Trax spiral staircase landing 
Dimensions: 11"H x 9"W x 16" Deep