Rovera 4W, $200
If you want something a little more rugged and “off road” than the 2W, the Rovera 4WD kit offers a four-wheeled robot with a larger platform to add additional sensor packages and other components. Like the 2W, it comes with all of the parts you need and the Make an Arduino-Controlled Robot book to guide you through the build process. Rovera is a great way to delve into the worlds of both Arduino microcontrollers and robotics. Both versions of Rovera come with the Leonardo Arduino board.