While its most likely a stock issue, its crazy news anyway.
It looks as though the highly anticipated Mario Kart 8 might be sold out on Amazon.com. The game is currently only available via email alerts, meaning if someone cancels their pre-order you may be able to get a copy. Whether it’s sold out due to volumes of pre-orders, or is just a stock issue, remains to be seen.
Update: The sales rank is 415 so it’s most likely a stock issue.