by C.A. do you mean california..?
There are probably a few LEGIT shops in the US that could set you up as a dealer/distributor in Austrailia.
The trouble with buying stuff off the classifieds from so far away as you are, if you send the guy 6800 bucks and he doesnt deliver, there is not much you can do to get your money back. It would cost that much for you to fly here and try to find the guy. There are other channels to go through, to find the guy, but so he gets arrested and jailed, you are still unlikely to get your money back.
Good luck in your endevour...