Just go to google and type in pan and tilt webcam or simlar......Ive used Canon and a few others inc this one.
http://www.videocentric.co.uk/camera...vi-d100p.shtml
A good second hand cam should cost around $300-400 or a new one approx $800-$1000.
If I was buying one today I would go for the new SonyHd one thats around $1200 ..(sorry dont have a link at hand for it)