A froend gave me some 20 foot 2x6’s he took from the garage he tore down. I didn’t think I would ever get all of those old nails out.
The longer boards are worth the effort, not sure the shorter ones are.
My father NEVER bought a piece of new lumber unless he could not find what he was looking for at a salvage yard.
I grew up with a “Cats Paw” in my hand and heaven help you if the sparks started flying while he was cutting it with a power saw.