Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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The Arbotix Commander comes to mind. With a 2.4 GHz Xbee (the default) it is a 2.4 GHz band serial data transmitter that you can receive using another XBee.I would link to it on trossenrobotics.com, but that site seems to be down right now.