I was just on Mouser and found this item. It's sort of pricey ($950), but would be a cool thing for experimenting with group robot interaction/cooperation, etc. I was not familiar with the Zigbee
802.14.4 networking protocol. I'll have to educate myself on it now. I'm guessing that you could build the boards much cheaper in the home lab, but this would be a good start. I'll post more on this later.Shawn