So you want to build your own Arduino friendly robot? The Hackabot Nano kit has you covered. It is a compact plug-and-play Arduino robot that helps you learn a thing or two about robotics and programming. It offers WiFi and Bluetooth connectivity. The robot chassis is designed to let you mount up to 4 motors directly. The kit also includes GPS, gyroscope, accelerometer, and an ultrasonic distance sensor.
Hackabot Nano is designed to help you get started with Arduino programming faster. Sets you back $199 at this time.