The Turtle Beach PX5 is the most technologically-advanced headset ever designed for PS3 and XBOX 360 gaming, incorporating a programmable digital signal processor to allow independent customization …
Cheapest I've seen these wireless headphones, with the exception of a Amazon one day lightning deal earlier this year (which didn't include shipping to Australia).
Turtle Beach Ear Force PX5 Headphones for US $159.99 + shipping. Deal ends 4pm Sydney time.
I got the same one some time back for AUD 207.58 + shipping