a couple of years ago i got about 25 builders security fencing panels, best wire i ever got, you can put up a 9x9 run 7ft tall, thats 4 panels in 10 mins, move them onto new ground in 10 mins, just cable tie the corners no posts needed, 6 panels does a 18x9 run, new about £20 each, 2nd hand from a scaffold company about £8 each.... got some new birds comeing monday took 10 mins to put a pen up. fox proof apart from digging, put a fruit net roof on when chicks about= magpie & crow proof.