Well, straight from KM2 the board cost about $100. If I'm not mistaken, you can't get these new any more, so they are getting increasingly rare. Plus, I asked Rainman how much he thought it was worth, so I have professional imput on it.
I know the price may seem high, but it isn't set in stone. It is OBO. Unfortunately, I can't go as low as $30, but if it doesn't sell after a while, I may get back to you.