The price for the LineFollower version 1.0 (LineF) is $12.50 plus $4.00 S&H. The LineFollower kit contains all the necessary parts except for solder and hot glue.
Instructions for LineFollower
Sample LineFollower Code
A Squeak eToy demonstration program of the CheapBot robot
Link to Squeak Land where you can download Squeak eToys - it's