I wouldn't expect it to sell very quickly no matter where you post it. You've already listed it with ebay; The only other large market for Legos I'm familiar with is Bricklink at http://www.bricklink.com/
. I googled "Disney Memorabilia" and this site came up: http://disneymemorabilia.com/
. I know nothing about it but perhaps in might give you some leads in trying to identify prospective buyers. Good luck.
Edit: After taking a closer look at the Disney Memorabilia site, they do have a forum with a Buy/Sell/Trade thread similar to this one.