I'm not too sure if I understand what ' tin ' is exactly but recently we took out a ton of ventilation ducting which we call gavalvanized tin ( I'm not sure if it really is tin ". Anyhow the surprising thing about this was that the scrap dealers didn't want it, said that the price for tin was too low to make it profitable to load and ship out. One guy did eventually take it, he had his own BobCat and it had a thumb, so he ran over the ducting and squished it with the thumb, then loaded it into his own dump truck which he drove. A one man show.
Anyhow if galvanized ducting is indeed tin, you might want to look around a construction site in your area where they are doing a reno, or call-up a local tin bashing company.
KTK