The 33 cents store is a store that sells everything for 33 cents; these things include cool ranch soda, plankton from Mexico, Skittlebrau, "That 70's Show" mugs, and Marge's green dress. (A blue version also makes an appearance in the episode “Thirty Minutes Over Tokyo”).
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33 Cent Store

After Snake steals the Simpsons' savings account funds at the Java Server, the Simpsons attend a seminar on how to save money. In order to save up for their family vacation, they shop at the 33 cents store.