Build a robot! Pololu 22T Track Set! ($12.95)http://compare.ebay.com/like/190682513664?var=lv<yp=AllFixedPriceItemTypes&var=sbar&_lwgsi=y&cbt=yTamiya Tracked Vehicle Chassis Educational Model Kit (About $23 with shipping)http://www.google.com/shopping/product/639688927265948080?q=robot%20tracks&hl=en&client=safari&rls=en&psj=1&bav=on.2,or.r_cp.r_qf.&biw=1338&bih=1032&sa=X&ei=jRhFUeL-MLDi4AP6m4HIBQ&ved=0CHIQ8wIwAjg8
The first one does not come with motors, which will cost $16/each.
Because you are using analog motors I had a harder time researching code as most people modify the tamiya to use continuous rotation servos.
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