I've read in @geoff's answer that SpaceX is doing some experimentation that may lead to fairing recovery capability. In fact I remember hearing Elon Musk mentioning a few years ago that it was being seriously looked at.
Originally I hadn't given them much consideration, and in the back of my head I probably thought of them as big fiberglass shells that kept the wind off of the payload. However within the first minute of each launch there's always the mention of max-Q, and in some un-manned launch cases thrust is reduced during max-Q specifically to decrease stresses in the rocket's frame - thrust is pushing up on the frame while aerodynamic drag on the noise is simultaneously pushing down on it. And the "nose" which experiences this stress is actually the fairing, something that has to separate into pieces and reliably clear the area shortly thereafter.
So I am wondering, what goes into the manufacture of a 21st century fairing that might make it expensive enough to recover and refurbish, and to then convince a customer your going to protect their payload with a used fairing? Expensive high strength alloys? Expensive manufacturing techniques? Integrated sensors and actuators?
The "Skybox" and the "Atlantis" - selected for their SXSE sounding names. 21st century fairings are much more than passive rooftop boxes to "keep the wind off of the customer's stuff."