It's at the "Darkside Depot" across from the HISTA playground. I think they usually carry Muppet's merchandise but it's been refitted for Star Wars Weekends. They have soooooooooooooooooo much Star War's stuff!
Something tells me they may keep this one around, from the looks of it, it's been WILDLY popular :) Check the souvenir shop near Star Tours :) They also have the same sentiment on a pin! I bought that for my girlfriend who is a massive fan.