My coop ran about $200. I recycled quite a bit of stuff. Received several rough cut 2x6's from father in law that he had laying under a tarp in his back yard. I used those for the rafters and to frame out the run.. My neighbor had a few sheets of leftover sheet metal roofing from when he built his garage. I had a couple 8 ft lengths of welded wire that was used to protect some apple trees. The base of the floor was built using wood that was being discarded from an above ground pool surround.
See thumbnails below and click to enlarge.
See thumbnails below and click to enlarge.