Cobra stores his car at Morgan Storage in Manchester NH, but they have other locations.
Pretty decent prices.
Call around to local storage facilities in your phone book and check them out.
Lots of them rent out to people storing cars. The spots fill up fast in the winter months, but you may still be able to find something.
It's a good idea to go look at them before you book though just to be sure you want to put your baby in them.
One thing to look out for is how easy it would be to drive your car into the spot. Some facilities have a little lip before the unit, so that might cause some problems getting the car in and out, unless you made some sort of ramp.
