Make your own bricks. Knock out a few thousand of these & you'll have a house in no time.

HOW TO:
These type of bricks are known are formed by a cement and soil mix, then forced with a pressure of 70 to 100 pounds. The brick formed is then ejected, set in a cool place, and left to cure for up to 3 weeks.
These bricks may be labor intensive to fabricate, but are also strong, durable, fireproof, cost very few out-of-pocket dollars, and have good insulative qualities. In short, if you've got more time than money, you want to build with native materials, and you need a structure that will last .
Read more: http://www.motherearthnews.com/Do-It-Yourself/1976-05-01/You-Can-Build-With-Soil-Cement-Blocks.aspx