Are you searching for the perfect tract of land? Many preppers are presented with the challenge of getting out of their current urban sprawl in order to be in a better place come the collapse. It is this mindset that pushed people to the search for land. Or preppers could be looking for a nice bit of bug out land. Eventually you are going to want to put a structure on that land to maximize its use for you and your family. Without a home you could still wind up dying from the elements. You will just die on your own land.
This article is a great look at how to build dirt cheap homes. There is advice and techniques that come, not from a prepper but from an actual home builder. If you are interested in building a home this is a great article.