Here is another micro:bit coding kit that comes with everything you need to build a fun robot car. The Kittenbot micro:bit robot has omnidirectional wheels. It comes with micro:bit + Robotbit board, 4 motors, protective case, and 4 omni wheels that you need to put together. The robot can be controlled via an app.
You get a Scratch based programming interface to program this robot. Costs under $110 at this time.