Sound Stage 1 between tsm and backlot express attraction. There are 2 separate queus. The merchandise queue is to the right as you face the building. The Funland queue is to the left. Funland exits backstage. The Trading Post exit is the same as the entrance.
It use to be an actual sound stage. It was part of the backlot express and you walked through it from above looking down through windows. I think it may have later been used for Millionaire.