Kent, I also know a lot of people who find stuff that they can not use and think of me. I do pay a
reward for somethings, but not for everything they bring me. I will horse trade a for a valuable item if I have something they want, or do a little welding for them in exchange for their item(s). I also hit garage sales and auction sales looking for stuff I can use, sell or trade for something I can use.
Once I get my pickup truck running again I will start taking
"Sunday Drives" again, or what I call
"Junk Spotting Trips" in the early spring and late fall. I have found structural steel, old ag equipment and a few tractors that way.
I had a friend who passed on last year, he and I would take turns driving around looking for stuff to buy, we found him an International bulldozer about 15 years ago about the size of a John Deere 350. The, dozer was setting in the weeds behind a house that was for sale, we contacted the real estate agent and went in and checked it out, two new batteries and a starter relay the old girl started and was loaded on his trailer for the trip home. He paid the estate what it was worth for scrap at the time, about $100 if I remember right.
With the scrap madness the last few years a lot of stuff has disappeared, but there are still a few good areas around here to look and after all things quit and break everyday.

We have one scrapyard that will let you look, the one guy that works there does keep an eye out for certain things for me, like John Deere crawlers and early tractors. They do not show up often but once and a while they do. I have bought three restorable tractors off of them and had them resold before getting home with them.
Dan.