I knew of a guy, about ten years ago, who did dumpster diving at the end of each month to take advantage of apartment dwellers who threw out stuff rather than take stuff with them when they moved.
He said he made an additional couple of thousand doing that.
I have a storage locker for my job. I always scan the dumpster when I drive by.
I got a brand new bicycle once. The best one though was the day I saw a 6’ folding table in the dumpster. As I was pulling it out, an old guy came out of his locker and said he was thinking of grabbing it. I offered to let him have it but he told me to take it.
Then we started talking. This 92 year old man is a picker. He mostly buys and sells books. He told me that he had several suitcases full of stamps. I told him I have a friend who buys and sells stamps. My friend ended up buying the entire lot for $2,000 and then gave me a 10% finders fee.
$200 for talking to an old man at a dumpster.