hopefully someone with more knowledge about acquiring bitcoins with AUD will come along.
What are you looking at me for? I buy my bitcoins with cash. You know why? Because ever since the introduction of the new ePayments Code (well, it's not really new, but banks have only recently switched to it),
all electronic transactions in Australia may be reversed for up to 7 months. Almost every Australian bitcoin exchange has been forced to close or stop accepting direct deposits for this reason. BitPiggy is, to my knowledge, the only one left that still accepts direct deposits, but only for established users.
As far as I know, the only real options for buying bitcoins with AUD are cash and international wire transfers. Sorry. Blame ASIC for this mess.