I like old cold chisels and star drills as stock for new chisels and punches---and knives.
I try to buy finishing stuff getting a good knotted wire wheel for a buck sure beats the store prices!
Lets see today I picked up a Al clipboard with Al cover handy not to have your sketches collect forge welding flux and immolate!
Rags, gas tanks for bells & dishing forms, old hatchets to re-work, spud wrenches to make into bics; old adjustable wrenches to make into twisting wrenches, old calipers to transfer distances onto hot steel, old carpenter's squares to make hook rules for hot steel out of, trashed socket chisels to make arrow/spearheads from, Files for knives and filing---look for a file card too!, Misc unplated or coated scrap metal at a rate cheaper than buying it new. Ballpeens to forge into tomahawks and handled punches, aloe plant to have handy to the forge..., old beer keg for quench tank, Shelves for the shop, lights for the shop, cheap solvents, cheap paint, deer antlers for knife handles, silver, babbit, lead, copper, old revereware pots you can replace the handles with basket handles for camp cooking.....if you look long enough you can find most anything including sharkskin for knife handles and human bones---laboratory skeleton parts.
Oh yes a plastic squid to lurk in the bottom of your quench tank *very* *important*. (You are supposed to age your own disreputable hat rather than cheating by buying one already well on it's way)
Thomas