Up to a few years ago, I would pick up brass that others left behind at a public outdoor range. At that time my LGS woud buy the brass. He would pay either $1, $1.50, or $2 for a block of 50, depending on caliber. He would then sell it to reloading companies. I paid for all or most of several guns that way. But I flooded the market and he quit doing it.
(Luke 11:21 KJV) When a strong man armed keepeth his palace, his goods are in peace:
(Luke 22:36 KJV) Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one.