Corten Cor-ten normally isn't that cheap. In case you haven't checked Google images much it changes as it ages.
Some suppliers sell preaged stuff.
Nobody would sell non-galvanised corrugated iron. But you might be able to pick up old stuff that's started to rust from somewhere. If you'll pay more than scrap value I bet a farmer would sell you some - they're always up for making a profit.
Corten Cor-ten normally isn't that cheap. In case you haven't checked Google images much it changes as it ages.
Some suppliers sell preaged stuff.
Nobody would sell non-galvanised corrugated iron. But you might be able to pick up old stuff that's started to rust from somewhere. If you'll pay more than scrap value I bet a farmer would sell you some - they're always up for making a profit.