Just picked one of these up at Target in-store. Couldn't find them online, but they have packages with the Gioteck EX-03 Bluetooth headset found here: http://www.amazon.co.../dp/B005LN5UOC/
And they are bundled with your choice of Black Ops I (with the 5 bonus maps) or GTA IV (vanilla).
Pretty decent deal I think.
Didn't check to see if they had corresponding 360 versions.