Sometimes fencing places in your area will give away the old stuff so they do not have to pay the disposal fee. Also, they may keep a list of people who are looking for that kind of stuff. I know a friend of ours who owns a fencing company does that.
We built almost our entire coop of recycled pallets and wood. The only thing we paid for with our coop was the chicken wire to go around it. I also have to compost pile in there for them to dig through.