In a Tractor Supply Company catalog a few years ago, they had some plow points that were described as "1080 tool steel" and some allen wrenches described as "6150 spring steel." I can't find either of those on their website, but all of the bush hog blades and some of the finish mower blades in their on-line catalog are described as "5160 spring steel." If you forge, these might interest you, but you can certainly get good steel cheaper in other places. Brand new simple steels are much cheaper, delivered to your door.
Todd