The price for the CheapBot-20 version 1.1 (CheapBot-20) is $48.00 plus $4.00 S&H. The CheapBot-20 kit contains all the necessary parts except for solder. An assembled and tested CheapBot-20 is available for $58.00 plus $5.00 S&H.
Instructions for assembling the CheapBot-20
Instructions for making a progamming cable
Datasheet for the TA8080K motor driver used in the controller
A Squeak eToy demonstration program of the CheapBot robot
Link to Squeak Land where you can download Squeak eToys - it's free!
To program the CheapBot-20's PICAXE-20M2, you'll need to download the PICAXE Programmer. It's free at this link