GA near NYC
Best site for general info is airnav.com.
I'm pretty familar with the Jersey side of things and supply is tight.
If you are JFK based Long Island is the place to look but I suspect the situtaion is the same as New Jersey.
Getting a hangar anywhere around here is very difficult. Waiting lists are really non existent. Seems you just have to luck into one.
Princeton had a few some time back.
Teterboro and MMU I would not bother with and CDW you'd need to be really lucky. (Last I heard a hangar at CDW was $800 per month) I do know MMU is very expensive for GA
Sussex in northern new jersey might have some but it is quite far and fairly primitive.
Linden would be nice but I'm again I'd be suprised if anything was available.
Trenton - TTN or Allentown ABE would be good places to look - ILS's and not swamped with commercail or corporate traffic.
I'd just phone around and keep asking - you might just get lucky.
Good luck -
20driver