Robot Wars is a Barnes & Noble exclusive paper robot kit from becker&mayer! Books. The project is a joint collaboration between Matt Hawkins (paper robots), Katie Stahnke (design) and Erika Kern (words).
You build the pre-cut paper bots and place a wind-up mechanism in them. Then, you can let them battle it out. Hence, Robot Wars. You can pick up a copy from the B&N link above for $7.99.