Just a quick update in case anyone finds this via google:
I called most of the scrap dealers around me that I could find today. They were pretty much all a flat out no except for one. I went to check out the only one that would let me in, but the selection was very limited and quality was low; mostly copper sheet metal covers of thickness 2-3mm, and some burnt busbars which were roughly 30mm x 10mm with lots of tapped holes in them. No solid round at all. They had a huge amount of cable though. Price from them was AU$10 per kg, approximate price for today on the metal markets is AU$9.50 per kg.
I also called George Weston, and they quoted me for a brand new 300mm length of 2" square bar at about AU$12 per kg.
Edit: Ok, I take that back. Something felt wrong so I double checked my quote with George Weston, they are actually quoting AU$45 per kg (there was a mixup in the length of bar)!!!!!! Maybe not such a good idea after all. For reference, I just checked and McMaster is about AU$32 per kg.