NME/Alien Vaporworks Board
You want to talk about rare, this is it. This board was made for Team Avalanche and from what I gather on the internet, only 10 were made. They used the boards in HB when Avalanche was sponsered by System X. I have here one that as never been used. It comes with everything pictured. The board, cable, software, switch, eyes, and two battery harness. This board will also fit the Alien Interceptor and Remains since they use the same board as the NME. $175 shipped for everything!
Some more info: http://www.pbnation.com/showthread.php?t=902994