Cooking Supplies is a supply store seen in the episode You Don't Know Sponge. Obviously, it sells kitchen supplies. SpongeBob found Patrick in here with Larry the Lobster and thought they were best friends.
The building looks like a giant mitten with a wheel on it that says "Cooking Supplies".
 What It Sells
Various cooking supplies can be found here, including graters, cooking pots, and blenders. SpongeBob hid in the cooking pot.