People from all over the five boroughs, and even other states, come to Chinatown for its produce. They're drawn not just by the selection of Asian vegetables which might not be as available elsewhere, but because of the low prices. You might imagine that means the quality is low as well, but in fact, the high volume of sales in the neighborhood, and direct relationships with suppliers as far south as Central America, mean that the produce sourced by Chinatown's groceries and markets are fresh and high quality.