You can just shop at Disney world parks, tell the Guest relations you just want to shop and buy a days admission and they will refund it if you return within the hour. Don't forget Downtown Disney opens 9.30am til 11pm if you forget anything!!

If you buy something in one park and want to return it, you can return it at any theme park including water parks and Disney stores too.

If you see something you want, buy it there and then as all the shops within the parks sell different things and you may not see it again.