Much simpler to wait until after you move to Maine to buy the car, unless you badly need a car in NY for the summer. If all you want it for is weekend trips and the like, look into one of the car sharing services, like ZipCar. If they have cars near you, they can be very convenient and are cheaper than owning a car if you only use a car once or twice a week and don’t drive very long distances (by which I mean hundreds of miles). Last I checked ZipCar had a three-day limit per use, but they can waive that limit if you ask. We used their cars several times for five-day trips to Southern California, piling up about a thousand miles. With every day you use a ZipCar you get a free mileage allowance (it used to be 125 miles, but don’t know now) and are charged for every mile above that. Insurance and gas are included. There is a credit card for gas in the car. It’s a well-thought-out system, ideal for people who don’t commute by car.
We used ZipCar for those trips to Southern California because they were about as cheap (counting everything) as a standard rental car would have been. For longer trips where you start getting discounted weekly rates the rental car is cheaper. But for errands and weekends away it is hard to beat ZipCar (or similar). What we also liked was that the car was already right in our neighborhood, so we could walk over and get it, and that when we made the reservation we knew exactly what car we were getting. We could see online the availability of all the nearby car and decide what we wanted. If a Prius was available, we could take it. They even have trucks, vans, and premium cars for more money. Most of their cars are practical compact hatchbacks, perfect for errands, but large enough for longer trips, too. Admittedly we’re in a city and neighborhood with a super high density of pods (groups of ZipCars), but if you’re in NYC or another major city there will probably be car sharing services of some sort. In the suburbs and smsll towns, well, you need a car. Or use rentals if you only take infrequent trips.
Hope this helps give you another possibility. We signed up for ZipCar just after it had come to San Francisco. Our Civic had been totaled and my partner couldn’t decide what he wanted to buy, si we signed up with ZipCar temporarily. It was eight years before we bought another car, and then only because I was having serious medical problems that had already needed an ambulance trip. Much easier and cheaper to get me to the ER in our own car. ZipCar wasn’t practice l for that, but for everything else it was fine and much cheaper than having a car in San Francisco (though we do have a garage, so are better off than some.) Many of my friends who commute by public transit also rely on ZipCar, as does my brother in Boston. Most of them were parking on the street (painful) or paying a fortune for a garage space.