In the past few years, we have covered many cool Raspberry Pi powered robots here. Care to build your own? This SZDoit Robot Tank Chassis has you covered. It is a tracked platform for your Arduino, Raspberry Pi, and other boards. It ships with 10 bearing wheels, 2 tracks, and 2 9V DC motors.
With this tank chassis, you can build a robot that can be controlled over WiFi, Bluetooth, or with a joystick. It has a metal construction not to break as easily as cheaper comparable products.