If you can find a small rural airport, they may rent hangar space which is perfect. You can often share a larger hangar with a plane or other RV's, boats, etc. Also look at empty industrial space... there's often a ton of it here and there, some place where small contractors rent garage/office space combos. Do go "month to month" with an offer to be gone in 5 days if they rent it to get the best terms. Some of these are condo spaces, and an owner may sublet part for less than it's costing because 50% of something beats 100% of nothing. You just have to be hardass - but also reasonable. If you want to keep it hooked to electricity or have heat in the space it WILL cost more.
Today is a gift, that's why they call it the present.