The tofu shop on the east side of Mott between Canal and Bayard (I think) sells an interesting array of items in addition to their homemade tofu, which I pick up every couple of weeks. I recently tried their pork dumplings/wontons, which reside in the righthand freezer as you walk in the door. About 20 come in a plastic-covered styrofoam pack ($2.75), and they're perfect for soup. I find these much better than the equivalent Sun Dou dumplings, with a very fine wrapper as opposed to Sun Dou's overly thick ones. The dumplings I got were pork -- I'm not sure if they sell any others.