My latest shopping excursion in Chinatown included a stop at this great market which I consider as the best place to purchase:
Lop Cheong 5.95/lb.
Whole Salt Cured Duck 13.75/each
They also had Zhongzi/Joong for 1.75 each......... made with Salt Pork, Pork Belly, Lop Cheong and Mung Beans.
Sun Ming Jan
111 Hester Street