156 Sullivan St.
between Houston/Prince Sts.
An Italian cheese monger that is famed for its smoked mozzarella. If mozzarella is a key ingredient in your dish or your meal, this place is worth a detour even if it's all you buy there.
Both the smoked and non-smoked mozzarella are excellent and the prices are moderate.
What to know:
Joe's is located just a block from Raffeto's Pasta. Either store is worth a dedicated visit but why not treat yourself and go to both while you're in the neighborhood?