Learn how to get free building materials. As shown, sometimes you can get incredibly valuable trees such as walnut for free.
YouTube
Related:
The Treeincarnators (how to turn blowdown trees into valuable wood)
Milling and Selling Specialty Woods
Slab Furniture
Bandsaw Sawmill
Also see Low Cost Wood for DIY Homebuilders https://naturalbuildingblog.siterubix.com/low-cost-wood-for-diy-homebuilders/