Webcams are prices based on some of the following Features...
-Image quality
-Ability to move the camera from the computer control (left right up down)
-Plugs into (Router vs USB-PC) Allows for your OC to be off but still view webcam from net
-Screen shot options, take video...
-The brand can also influence the wbecam.
-The size
Find out what you need and get what you need.