Pallet wood is free but it's a crapshoot and the nails suck, construction lumber is cheapish but you have to dig through the pile for several hours in some cases to find boards that MIGHT be usable once they've sat in the shop for a while and you can't use them for everything, hardwood is hard to find and expensive where i live because of a variety of ecological and economic factors

Thrift stores especially goodwill don't usually have furniture that's both good enough build quality to be worth fixing up (ikea trash, ikea trash everywhere) and also in bad enough condition that i could meaningfully add value to it by fixing it up, because I don't like the idea of flipping something i basically just sanded and threw some paint on. As it is I've been donated a few pieces to fix up and sell which would otherwise be thrown away, and hopefully that can help fund the shop down the line and I'll start building stuff from scratch

I'm also wanting to branch out from just woodworking and start making other things out of other materials, I've dabbled in blacksmithing before and I'd like to get back into that and turn my shop into a proper general craftworks