http://en.bitcoin.it/wiki/Selling_bitcoins
Since PayPal considers bitcoin an "ecurrency" (per mndrix from when they informed him his PayPal account was being shut down) and they are now enforcing the "no ecurrency" transactions, then converting from bitcoin to PayPal will be a little more difficult than when CoinCard was available.
There are a number of individuals on the #bitcoin-otc marketplace who would love to buy your bitcoins from you (or your MTGUSD as well) and pay for the purchase using PayPal:
- http://bitcoin-otc.com/vieworderbook.php?type=buy¬es=paypal
To assist you with that to know better the risk in accepting PayPal from someone is the OTC Web of Trust (WoT) ratings:
- http://bitcoin-otc.com/trust.php
Being in Australia, there's this offer:
- https://bitcointalksearch.org/topic/bitcoin-seller-taking-cash-deposits-in-australia-5967
And there's also an IRC channel specifically for Australian Bitcoiners: #bitcoin-aus perhaps you can establish a trade in person?
- http://webchat.freenode.net/?channels=#bitcoin-aus