I haven't seen anybody else post this, so apologies if it's a double-up.
Seemingly a part of a Black Friday-inpired 'Flash Sale', if you don't want the box then US$13.99 is a crazy-cheap price for BioShock Infinite on PS3. You just need a US PSN account.
For those unfamiliar, the PS3 allows you to have multiple worldwide accounts, but use games downloaded from any on any other of those accounts. So you could still get trophies on your Aussie account once this is installed, for example.
Other titles in the sale are below. Links to my brief thoughts on each are, of course, completely optional. :)
Diablo III - $39.99 (http://gamesblip.com/review-DIABLOIII.htm)
The Last of Us – $39.99 (http://gamesblip.com/review-THELASTOFUS.htm)
Saints Row IV - $29.99 (http://gamesblip.com/review-SAINTSROWIV.htm)
God of War: Ascension - $19.99 (http://gamesblip.com/review-GODOFWARASCENSION.htm)
Deadpool – $24.99 (http://gamesblip.com/review-DEADPOOL.htm)
Splinter Cell: Blacklist - $29.99 (http://gamesblip.com/review-TCSCB.htm)
Rayman Legends - $29.99 (http://gamesblip.com/review-RAYMANLEGENDS.htm)
(The sublime Rayman Legends is also on sale for Vita, but the handheld doesn't allow content sharing between PSN accounts without a lot of hassle).
I can't believe I have taken so long to play this game. Been playing today on Steam, wow.