As I understand it was a limited print run, it's hard to convince people to buy 3 different versions of the game (consumers and retailers). Especially when it was also part of a console bundle (which historically takes a games value down to $5 or less). The Gold version isn't that easy to find either - but again if you find it, it's typically about the same price as just getting the normal one and paying for the DLC. If you want the PH DVD though, good luck!