Bangkok Center Grocery
104 Mosco St.
between Mott/Mulberry Sts.
Here's a place to find those kaffir lime leaves. A pan-Asian grocery in Manhattan's Chinatown that offers popular and hard-to-find ingredients for all Asian cuisines.
Their selection of Thai ingredients is especially notable and they have a large selection of curry pastes and the often hard-to-find ingredients to make Pad Thai and Tom Yum.