The Kwik-E-Mart is a convenience store in Springfield managed by Apu Nahasapeemapetilon. It is run mostly by Apu, but occasionally Sanjay helps. In many future predictions, his several kids all have roles in the maintenance of the Kwik-E-Mart.
Barg'N-Mart is a supermarket in Bikini Bottom. Lou is the only employee mentioned. Their famous product is Kelpo cereals, but also "Meets your spatula needs," as stated by SpongeBob. This store is the common marketplace for all Bikinibottomites, similar to a Wal-Mart or Target in the ocean.
Crazy Dave's Twiddydinkies is Crazy Dave's shop, and is located in the trunk of his car. The player gains access after finding his Car Keys at the end of level 3-4(The level before Big Trouble Little Zombies). Once in every level set (Fog and Roof) afterwards, new merchandise will be added. The player can purchase more seed slots, plant upgrades, new defenses for the Pool and the Roof, Zen Garden items, upgrades, and various House Blueprints.
Wally Mart is an obvious play on the real store, Walmart. There are various assortment of items, including furniture, and random boxes on the shelves however, you cannot buy these.
Maxi Mart is a convenience store located in Highland (and possibly other locations aswell), the store itself is similar to 7-Eleven.