I was making a pickup of some supplies and spotted an agricultural building being re-roofed. They were taking off the ag metal roof and replacing it. I asked what they were going to do with the roofing -- scrap it -- I asked how much? and they said $160/ton. So I said I'd pay $320 a ton and they said DEAL.
1500lbs of metal roofing at around 2 cents a pound. Total was $249. Enough to build my new cow barn and a loafing shed. I love recycling!