Sorry all sold, and I'm not getting anymore (out of the batch of 5 that I bought off someone else, there was a dud one, and I'm wearing that cost, so no more from that source, but that's business).
If I was after a regulator I would look at the UK. Not as cheap as the US, but still better than $120-$150 that you often see in some shops, although the saving will be small and probably not worth the hassle.
You can buy a 2 gauge regulator from the UK for 30pounds and postage would be about a further 7pounds. Based on today's exchange rate 37pounds is equivalent to AUS$95. So for around about $100 you would get a brand new 2 gauge regulator, but have to wait about 6 weeks.
http://www.welduk.com/Details.asp?ProductID=82
I've spent a lot of time looking at the issue of CO2 regulators and bottles, and tried to work out the best way around the higher expenses in Australia. My conclusion is bite the bullet and get a regulator from Australia, and use a fire exinguisher as the gas bottle (such as from Goliath's). You should have no problems getting this refilled as it's an everyday item and need. When you start faffing about with non-standard items you have to find someone who is willing to "help out", and these people can be rare. Plus let's all remember that CO2 is under pressure and the more you mess about with it, such as adaptors etc, the more elements you introduce which can go wrong, and with pressurised gas that can have tragic results. I recommend to keep it simple (particularly for desk jokeys like me).
Cheers
MAH