The mud bricks. They are BY FAR the cheapest to procure. No transportation fee because it’s right next to your house, and no materials fee because it’s free from the earth. It lasts decades with only minor patchwork repair needed. Anyone can do it and you can literally put up a house in a few days. It’s so good at insulation it hardly needs any AC or Heating. So your costs are absurdly low compared to any other building material. You can straight up put up a house for $10k

Snoop Dogg sold out and lost his street cred in like 2005

Adobe is the best of you live in the right environment for it