This a very cool vision camera for the price. I bought mine for 70.00 USD.
Link to where you can buy if from Adafruit.
It is a little big for my like but the camera can do a lot of vision processing on board. Which is a great help if you are using a dumb controller like the Arduino.
Link to Wiki page for basic tutorials.
My next project is to get it to work with the CM-904c. (link)