Buy Robot car?

Im starting on a project where i want do to some AI programming for at Robot car. (small scale robot). But since im not that much into
hardware, I would like to know if its possible to buy a simple robot car with some sensors and a digital compas. And of course a onboard controller, or atleast is should be "easy" to adapt a cheap controller to the car, like the Atmel STK5000 kit has.
Any ideas? sugestions?
Best Regards.
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