Do you mean kaffir lime leaves?
There's a thai store in Chinatown that's on... I dunno, I kind just know how to walk there. The street goes to some park that's there, and there's a slight slope. This store should have it
There's also Kalustyan's which I think is midtown? I've gotten kaffir lime leaves there
Chinese groceries will not have them in Chinatown, only Thai grocery stores will.
Bangkok Center Grocery on Mosco Street, between Mott St & Mulberry St, it's kind of a tiny side street
Kalutsyan's on Lexington Avenue at 28th Street
Dual Specialty, Indian grocery on 1st Ave. and 6th st.
Eataly on 23rd and 5th usually has some too.
I like Eataly's price best. Last time I checked it was $2 for 25-30 leaves. Prepackaged by the vegetable section.