Hello, I would say 400 dollars complete with boxe and everything, and 250 if you only have the unit, the controller and the cables. But wait for other opinion from other guys here
They sit on ebay all day at 250 and sell for less. $199 loose or less. Boxed, perfect collector shape, $500-1000
Pretty low but this is the market price. As these units can't be used by everyone, it is sometimes just for display only. So the shape of the box is important. I would have be able to buy it few days ago, but I have no money yet.