Mighty Ape offers the Tritton Trigger Stereo Headset for XBOX 360 for $64 delivered down from $104 delivered. Other competitors are selling this headset for around $90.
Reviewers on Amazon have rated this headset 4/5 stars based on 816 reviews. It should only take 1 day to receive the headset from Mighty Ape.
Offically licensed XBox 360 headset
In-line Audio Controller with Breakaway
Analog Audio Adapter
Wired Headset
Flexible foldable microphone