Some of you have expressed interest in buying your own kit to work with and play with.
This was the lowest price I found for the "Rock-it" Robot (be aware that kits come with solder and nonsolder options -- we use the non-solder options):
http://www.owirobots.com/cart/index.php?l=product_detail&p=6
Here's the Jungle Bot:
http://www.owirobots.com/cart/index.php?l=product_detail&p=14
Here's a cute and cheap little solar powered "king crab" robot:
http://www.owirobots.com/cart/index.php?l=product_detail&p=23