From the Super Mario Wiki
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Itty Bits is a chain of shops in the game Super Paper Mario. They are very small cooking shops located in various places, such as the Dotwood Tree, Flipside, Flopside, Land of the Cragnons, and The Overthere. The shop is so small, that only people who have been shrunk by Dottie or are already very small can enter. The shop's owner is very small, however, and is not seen for some reason. The shop sells cooking ingredients and rare items, such as the Big Egg and Horsetail.
Another Itty Bits can be found in The Dotwood Tree of Chapter 3-3. It is found past the tree on the far right on the first area of the chapter.
The last Itty Bits store can be found in The Overthere in Chapter 7-4. This store is located on top of the building right before the Rainbow Bridge.
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