George,
I have found most of my year round leases on Craigslist. Most owners will let you go check out the leases and I will line up about three or four to visit. I ride my 4 wheeler around and look for old washes and check out the hunting habitat. You would be surprised at how many old farms in west Texas just dump their trash to controle erosion. If it looks good I let the owner know that I am interested. I may start by saying can I grab a tire ring for a fire pit. Then I will say that I saw some other "trash" that we can use. The conversation usually ends with them saying you can take any of that old trash.
You will find antennas, pipe, ect. I even have an entire house that was torn down and dumped in a creek. Watch out for roofing nails and asbestos shingles.
It has worked for me. I have also visited hunting leases thaty friends are on and if I see a good spot, I will try to join.
Back in the day, people would not use landfills and just take it to the back of their properties.