Consider going to a mobile home park and asking for a free trailer.
That's what 6 of us did a few years back and here's how it worked out...
The park gave us a mobile home, as long as we moved it ourselves, so my buddy made a hitch for his backhoe and we towed it a few miles down the road to our work spot (very early in the morning, to keep the local cops happy).
We gutted the inside and got some free t&g pine board, made 6 bunks, one big table and left the kitchen alone. We also painted the outside to blend into the surroundings better (baby blue didn't work for us guys).
Packed the wheel bearings, put some new tires on it, strapped the crap out of it (has peak roof) and called the local tow truck company to move it into the spot 80 miles away.
We had a total of $2,400 including the tow bill and a couple hundred man hours.
I had an old wood stove I donated and our outhouse was already there from our old camp.
Wa-la, instant camp, just add water.
