First you pay for land, then you pay for shelter. Sometimes...
Lots of RVs and campers available for cheap - if you can find a compact way to handle
fresh, grey, and black water and to get power (could be very simple DC charge system
depending on your needs) then you can remove a substantial chunk of those of overhead
costs associated with being alive and not living in the woods AKA rent.
Here's a fixer-upper for $100
http://sfbay.craigslist.org/sby/rvs/3892303357.html
much nicer for $1500
http://sfbay.craigslist.org/eby/rvs/3886875523.html
cabover for $400...different mobility requirements
http://sfbay.craigslist.org/nby/rvs/3890658560.html
one for 250
http://sfbay.craigslist.org/eby/rvs/3889952340.html
For temporary lodging, a flatbed or utility trailer could house all the bits and pieces to
erect a sizeable facility.
Pack in some extra PVC and poly sheet and you have a deployable garden. I can't work
this sort of living at the moment but if anyone in town wants to retrofit one of these bad
boys to be more self-contained and awesome, I would be glad to help just to learn the ins
and outs. Would also be a good excuse to go to the woods for science.
happy hacking