I'm surprised it's getting preordered at all. It's much cheaper to just buy a used copy of base game and download the DLC than to buy the Iceborne physical copy.
Again this is COMG we are talking about. They are crazy for special editions and even crazier for Monster Hunter.
It is cheaper because that is the Master edition charting, I am sure a normal edition is the same price as the DLC, but clearly not charting.