Mickey's Star Traders and Merchant of Venus

the correct name is Merchants of Venus
Both stores are located where the attraction "Stitch's Great Escape" exits

The Tomorrowland Transit Authority also is here. The ride goes through Space Mountain. At one point, you see the original Walt Disney model for what he was proposing as Epcot or a city of the future. It is very cool.

Sorry, the ride doesn't start here, but it comes through here.

About that Epcot model upstairs, that is only visible from the Tomorrowland Transit
Authority, that does comes through this building... It is called Progress City and while it was the basic for the Experimental Prototype Community of Tomorrow that was to be EPCOT if is only a portion of the massive model that debuted in 1967 as the finale for Disneyland's Carousel of Progress. After the Christmas scene guest where invited upstairs to gaze out over this cityscape. When the Carousel of Progress was shipped to Walt Disney World for a 1975 opening, a section of this model came to Florida as well. It was installed as a part of the WEDway Peoplemover and can still be seen today by guests riding the attraction (now known as the Tomorrowland Transit Authority).