Just to point out for the GoPro Hero Cam 3 Black Ed., you can get one delivered from Kogan:
A$389 delivered from
Kogan.com.au
If you want more peace of mind of buying from a physical store:
A$399 from JB-Hifi
In case you're wondering why the pricing has dropped (and will continue to)?
HD HERO: January 25, 2010
HD HERO2: October 24, 2011
HD HERO3: October 16, 2012
Pattern recognition says HERO4 will be out in just over a month... .