$569 for the black version, $599 for the white. Shipping is free.
Seeing that this phone isn't available officially in Australia yet, I think this is a good deal if you specifically want this phone.
The Optimus 4X is LG's Android 4.0 flagship. Unlike many of LG's previous smartphone offerings, this phone has received good reviews and is generally considered a worthy competitor to the GS3 and the One X.
Specs include Tegra 3, 720p IPS screen (>300ppi), 16GB storage and quadband HSPA+. Full specs can be found here: http://www.gsmarena.com/lg_optimus_4x_hd_p880-4563.php
http://www.gsmarena.com/compare.php3?idPhone1=4563&idPhone2=…
Pretty much the same as the S3, I'd prefer the S3 as it has more support for custom roms, and even if you don't root your phone, LG seem to be one of the slowest with updates.
Battery life and camera are better on the S3, which also has those little features/gimmicks such as smart stay and pop-up play.