Steel scrap.
There are different grades of steel. Structural steel like angle iron, I-beams etc is worth more than tin. Gotta be cut to fit in their 4 foot square boxes though or they’ll give you crap. Tin is any sheet metal. A vehicle with no engine/transmission will get you tin price which is less than car price. Forged steel is another one.
About the only thing paying good money right now is catalytic converters, especially GM. Clean copper too of course.
I thought scrap would go up with the supply chains screwy from lockdowns but they didn’t except for soda cans. They were 30-35 cents forever and jumped to 85 cents for a little while.