What's your looking at is the RD02 - Robot Drive System. My brother originally intended to enter into a robot competition, but he got sidetracked and never finished it. He's now going to graduate school and left me to sell his possessions. As you can see, it's pretty much brand new. Those bags you see were never even ripped open. Manufactured in the UK, it would cost $180 to ship brand-new here to the states, but I'm offering it for $90 O.B.O. + shipping http://imageshack.us/photo/my-images/707/img1010mp.jpg/
You can find more information about the drive system here http://www.active-robots.com/products/motorsandwheels/rd01-drive.shtml
Only shipping within continental USA!!!