FREE4U
Noel Leeming offers the Xbox 360 Wireless Headset with Bluetooth for $30, down from the normal price of $60. The next best price for this is $47 in-store from EB Games.
This headset is review well on Amazon, receiving 3.7 out of 5. Most of the issues tend to be about the comfort of the headset. The best review I've seen is this reviewer who has tested the headset extensively for 9 hours a day for 3 years.
The Bluetooth headset works with Xbox 360 and also other Bluetooth devices such as phones and tablets.
Using the code FREE4U (thanks to kiwijunglist, you can get free shipping.
Compatible with Xbox 360 & Bluetooth devices
Blue and green LED rings of light visually show which mode the device is in
Noise, Echo, and Wind-noise Cancellation
8 hours of talk time and up to 300 hours of standby on a single charge
Includes micro USB charging cable that connects easily to the Xbox 360 USB ports
The device comes with three sizes of ear gels and an ear loop to ensure a comfortable fit during extended gaming periods
Via Geekzone