Creative Live! Ultra....
It costs $65 on newegg
But I got it off ebay for $17+ shipping... brand new, sealed package.
There are plenty on ebay.. you could get one too.. best deal EVER!
I originally got one for my gf, so I could chat with her with my Logitech Quickcam Pro 4000, which is a really highly acclaimed high end cam from logitech. I always throught it was the best quality a webcam could get. But once I saw the creative, I was blown away. The creative gives you a solid, clear video, with very natural colors and tone. It just doesn't have any of the webcam image quality feel. It also has a wide angle lens, which is really great, as you don't want your huge face on the screen all the time.
Go for the creative.