Bulk trash pickup,- nearly every city has one,- one of the weekly pickups for the month is for heavy / large trash. Call your city hall if you don't allready know. I'm always picking lumber out of the trash. - You could build your own house from what others through away. Job sites if you can still find them. Manufacturers w/ lots of CNC machines, will sometimes have a constrution site type dumpsters just for the wooden crates that imported castings are shipped in. Check craigs list under free stuff, - Some builders & other businesses actually want scroung hounds like myself to come get their junk.- Other wise they have to pay some one to hall it away. Your local industrail park is a good place for over size pallets,( don't take from their good piles ) shipping crates, ect.. Large print shops through away some interesting trash that can be used as building material. If you live some place extremly rural your only sorce for scrap wood may be adandoned barns, sheds ,& houses. Good luck scrounging.