South Park Episode 809 - "Something Wall-Mart This Way Comes"

The streets of South Park are like a ghost-town when a giant Wall-Mart lures all the townspeople to the new store with its incredible bargains.

Cartman becomes a boy possessed by the power of Wall-Mart and its low, low prices. In order to save their town, Stan and Kyle have to find a way to destroy the ever-expanding superstore while keeping Cartman from stabbing them in the back.