Where to buy assorted Mexican Chili Peppers for Mole Sauce recipe
Depending on your recipe, you can probably get the dried peppers at Whole Foods or Manhattan Fruit Exchange at the Chelsea Market. As gutsofsteel mentions, you are certain to find an embarassment of riches if you visit a Mexican neighborhood. Lexington between 100th and 116th has many Mexican markets and bodegas that can supply you with everything from mulato chiles to Mexican chocolate. El Tepeyac Grocery is located right outside the 103rd station if you want to make the trip quick.
Manhattan Fruit Exchange
75 9th Ave, New York, NY 10011
1621 Lexington Ave, New York, NY 10029