A-Mart is a little different from most Asian grocery stores in Madison, as most of the staff is young--so you sometimes get a "Hello" when you enter the store. It's almost disconcerting to experience that compared to most Asian grocery stores!
A-Mart focuses on food from a diverse number of East Asian countries. There's a little bit of Jamaican and Middle Eastern food, but the focus is on East Asian by far, and very few American products. They stock a limited amount of fresh bakery items from Chicago. Produce is inexpensive, but you have to inspect for freshness. No alcohol. Prices are comparable to similar stores in town.
I like the cleanliness and organization of this store, so this is one of my top Asian grocery store choices in Madison.