Fantasy Costco

Fantasy Costco is a retail store stocked with magical items and run by Garfield, the Deals Warlock. It is conveniently located on the Moonbase of the Bureau of Balance so Griffin can do all his character management at once.

The clothing department of Fantasy Costco shoots out with shelves and racks of clothes like in the Matrix.

Fantasy Costco theme song is a terrible, terrible earworm.

Inventory
Thanks much to Reddit user fishgutsd.