GearHead peripherals has been around for a long time though they're not known for anything but cheap computer accessories. And they have been making Mac compatible external webcams for sometime and were early adopters of the UVC - USB Video Class webcam standard. Of the few OSX friendly web cameras they offer, the only real standout is their top-end model, the 1080p HD camera. For bargain hunters, their similar-looking 720p model is even more affordable.
1080p HD GearHead Webcam
Stereo Microphone + AutoFocus
This Mac compatible GearHead webcam features an oblong design, auto-focus, and dual-microphones in a High-Definition web cam. Clearly they're trying to mimic Logitech's best HD webcam models with a knockoff of their own. And for half to a third the price of other top-end HD webcams this GearHead 720p or 1080p HD camera may be a reasonable choice for budget-minded Mac owners.