Build a house for less than $5000
If your interested in cheap housing.  Yurts are worth a look.  They are used by half the population of Mongolia, and can be very warm.  They make a great cabin retreat, but they are not quite as nice a normal american home without the added expense and convenience of plumbing, electrical, etc...However, in there base form, they cost around $5000.  See the link below for pricing:http://www.yurts.com/products/default.aspx(I am not affiliated with anyone selling any yurts, I just happen to like them).