Down where I work, a soap factory, we used to do all of our printing using aluminum sheets with the designs printed on them and separated in brown paper bags by company. Well, about six months ago we switched to a completely digital system and decided to clean out all of our plates, meaning they all got thrown outside by the dumpster. Since nobody else was going to use 'em, and I saw no reason to let money go to waste, I made multiple trips in my car and ended up with about 1526 pounds of alumnum sheets in paper bags in my garage. More importantly, I ended up with about 1200 bucks in pocket.
I did, by the way, ask my boss if I could have the sheets. He was happy to have me take 'em away. But I think I got the better deal.