Considering these don't show up very often, I think it is hard to guage a price. There is a GPK plate (adam bomb) current going for a buy-it-now price of $1800.00 which is down from $2000.00. Hell, I'd gladly sell my plate for $1800 but I think there is a snowballs chance in hell of that ever happening. A few other GPK plates are selling or sold for a few hundred dollars.