Some of my favorite "free steel" over the years has been the military 6 foot pickets. For some reason, sections seem to send them to the dump when they get dusty. I have even seen brand new ones, still strapped together on their pallets, tossed out.
Although they have those annoying notches every foot or so, I have always found them to be a good source of angle iron, and somewhat authentic for military purposes at that.
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