For in-store pickup only and stock varying by ZIP code, Fry's Electronics offers the Call of Duty: Modern Warfare 3 Wireless Bluetooth Headset for Xbox 360, model no. 42G-00001, for $19.99. That's tied with our September mention and the lowest total price we've seen. (It's also a current price low by $26, outside of the price below.) This headset connects to your Xbox 360 for in-game communication. It can also connect to Bluetooth-enabled cell phones.
Don't have a Fry's nearby? Walmart sells it for $25 plus $3.97 for shipping. Sales tax is added where applicable.