Based on media reports (and the simple fact that all hoverboard links are gone from Amazon.com), it seems that Amazon.com has removed ALL Hoverboard sales from their store until they are comfortable enough to sleep at night after media buzz around a few hoverboard fires. What next, remove all sharks from the Pacific after a few shark attacks?
Basically, if you want a hoverboard for Christmas, Amazon.com is too afraid to sell it to you. Which is surprising for a company that is run by a guy who tolerates exploding spacecraft.
Fortunately, you can still (for the moment) find a range of alternate hoverboard brands available on Amazon, including the Razor Hovertrax, the PhunkeeDuck and the Hover X.