Some companies won't ship ammunition to Kalifornia. Some companies won't ship ammunition to certain counties in Kalifornia. However, many outfits will. So, maybe it's the same thing with N.Y.? It's another state that's so overregulated that companies don't want to risk any liability.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams