Currency Exchange. A&S Foreign Exchange Inc. has the best rates in New York city. A&S Foreign Exchange Inc. will beat any competitors rate for the wide range of currencies we deal with. Buying of travelers' checks. A&S Foreign Exchange Inc. buys travelers' checks in some foreign currencies as well as U.S. Dollars. Where to Exchange Your Foreign Currency in New York City: Do call ahead to confirm that a particular branch will be able to accommodate your type of foreign currency. If you're looking to buy foreign currency, plan ahead, as many banks can accommodate you, but might need a day or two to get the type of bills you need. Buy or Sell Foreign Currencies Today. Retail services. For exceptional service and the best available exchange rates, please visit our New York Retail branches, on the West Side next to The Park Central Hotel on 7th Avenue, and on the East Side across from Staples on 3rd Avenue.