Take a look what i just found at amazon (yes i am often there )
Their description:
Product Description
Enjoy image-perfect detail and clarity plus motorized tracking. Motorized tracking automatically follows your every move, keeping you right in the middle of the picture. Get more detail and clarity from Logitech’s glass lens designed in collaboration with Carl Zeiss, the global leader in camera optics. Your images stay razor sharp, even in closeups. HD video and images have never looked so real at 960 by 720 pixels. A true 2-Megapixel sensor, with up to 8-megapixel … More >>
Go & get it here - i can recommend it:
Logitech QuickCam Orbit AF Auto Focus System