Just to update the information provided by SamuraiHP above, BuyBitcoinAustralia.com.au now only charges 7.5% fee!  That is the cheapest in Australia.

Customers so far have been extremely satisfied with how fast they receive their bitcoins.  After each purchase is complete, we provide a link to the block-chain so you can see the transfer of the bitcoins.  Shortly after, they will be in your chosen wallet.

We also now accept cash deposits and in-person meetings for Australian's in Melbourne and Perth.  However, we recommend our instant service for optimum convenience and speed.

Cheers,
Emm