I was at the scrapyard today. I'm there about every day, so not a rare thing. I decided to ask the dude if the ever come by any kegs. He says "you mean like that one over there? "
Long story short, I'm the prund owner of a FREE Coors keg, just begging to have it's lid cut off and turned into a HLT!
So the moral of the story is, don't be afraid to ask for free handouts. I scored the 50' of 3/8 copper for 20$ the same way, just yesterday.