I can confirm there's no Best Buy, Staples or other such store at JFK or La Guardia in New York. Also pretty sure there isn't one at Newark airport. However, if you fly into JFK or La Guardia and have a few hours layover, it's a quick trip (15-30 minutes from La Gaurdia, 40 minutes from JFK) into Manhattan (except during rush hour), where you can visit a Best Buy or Staples. If your layover is less than four hours (five for JFK), you run the risk of getting back to the airport too late to make it through security again to make your connection. Security lines for international flights out of both airports can be hellishly long.
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