The last link included by Bite Me is something similar to what i was going to suggest. I'm pretty sure you can buy that particular type of fencing at one of the big Hardware store around ie. Bunnings, Mitre 10. I've seen them at my local store. You could even contact fencing companies and see if they have any old stock laying around and then all you need is some new wire fencing BUT in saying all that is sometimes just as easy to buy it already made