The Summerween Superstore is a retail outlet located in Gravity Falls, Oregon. So far, there is only one worker that we know of.
The Superstore is first seen in Summerween when Grunkle Stan brings Dipper, Mabel , and Soos there to buy certain supplies for the trick-or-treaters. Stan has trouble with a barrel of fake blood, Dipper & Mabel run through the store with a wheelbarrow, and Soos pushes the skull on a candy bowl, which says Summerween-related jokes. It is later used by Dipper, Mabel, Soos, Grenda, and Candy to hide from the Summerween Trickster.