The IAC is not a sensor, its a valve. The full name is Idle Air Control. Also I believe when you say "C02" sensor you really mean O2 sensor. Both parts can be had from Autozone or Parts America for a lot less than any dealer, with comparable quality.
O2 sensor from Ford is about $90, Autozone is about $65.
IAC from Ford is about $65, Parts America is about $60.
Autozone couldn't find "idle air control" in a search but an "Air Bypass Valve" is around $40. I'm not sure if that's the right part, though.