THE COB BUILDERS HANDBOOK, by Becky Bee is an excellent resource for those wanting to build a warm, energy efficient, natural home, without a lot of money. You can build a home for as little as $5 / sq. ft. A healthy home with no chemicals, built of local materials with low embodied energy, is available to those willing to expend a bit of sweat equity. This book explains it all, from foundation to rook. We highly recommend it!