They used too, but anymore.
They used to sell a webcam called iSight.
But since all macs (except mac mini and mac pro) and Apple's computer screen all have inbuilt iSight webcams. There was no point in selling standalone ones.
Also the iSight Cameras worked on firewire ports. Which most computers do not have. And that Apple never made a windows version driver for their external iSight cameras, so the iSight can only use the basic video capture driver in windows. Which gives it video support, but not the audio capture.
