Just got back tonight from WDW. The lockers are $7, and you get $2 back at the end of the day. At MK, they are under the train station, and at EPCOT, go to the gift shop to the right of Spaceship Earth. I think the EPCOT lockers were a little bit larger than MK ones. At MK, we put in a square soft-side cooler and a sack of snacks. We didn't rent a locker at AK or MGM. Hope this helps! Have a great trip!