Meet DiddyBorg: a Raspberry Pi robot with a 3mm cast Acrylic Perspex chassis, 6 motors, two access motor controller, and full build instructions. You can use it to build robots that autonomously follow a ball. The robot is compatible with Raspberry Pi model B or model B+ and the Pi camera. You can control it via a Bluetooth remote control.
The kit requires batteries, SD card, and a Raspberry Pi, but you get everything else to get started. Yet another cool educational robotic kit.