Re: Building a $200 robot
I think it really depends on what you mean by build a robot.
You can repurpose a radio controlled car using an Arduino or parallax Micro Controller.
Arduino's start at 30 dollars or you build your own for less. http://arduino.cc/http://www.parallax.com/http://www.makershed.com/http://www.robotshop.ushttp://www.sparkfun.comhttp://www.trossenrobotics.com/
While the Lego system is by far one of the easiest to start with.
The Parts are numerous and the system is relatively easy to build yourself it's not the cheapest.
The NXT Brick is around 150 dollars by itself. And this doesn't include any parts.
The Base kit is a good starting point but is currently running over 250 dollars US.
For more informationhttp://www.societyofrobots.comhttp://makezine.com/