Moving with propane grill -- how to get rid of propane tanks?

Where are you moving from? If you're near Lowe's on 9th Street, you can bring the old tank there. They will give you a receipt which you can than use to reduce the cost of a new tank once you move into your new residence.

I don't know how long you can hold the receipt before buying the new tank. I've always done the exchange on a same day basis.

If you're moving within the area, you could just stick it in a box or bag and take a car from old to new place (along with those few things the movers missed or the cleaning supplies you left to use).

I think I've had that problem before--you get used to not having a car and hate wasting money on a cab so you forget that's an option.

Remember to keep at least one window open so any gas can escape. Otherwise "boom"!

Try contacting your local firehouse. If Bloomberg didn't shut them down yet

Please note that the NYC fire code bans propane cylinders in multi-family residences with more than two units. Check the FDNY's summer fire safety pamphlet for other issues regarding grills. Whilst I haven't heard of the city fining people for violations, I expect that this summer they will (just like its fining cyclists). I am also not sure what your insurance company would do if you had a fire caused by a violation like a propane cylinder or a charcoal grill too close to your house.