This is the cheapest i have seen this headset in a long time. Its definitely a good deal.
Heres the link: http://www.amazon.com/Xbox-360-Call-Duty-Wireless-Bluetooth/dp/B005OSFUL2/ref=sr_1_4?ie=UTF8&qid=1347784553&sr=8-4&keywords=call+of+duty+headset+mw3
Enjoy :-)