Amazon is likely to introduce a new Fire TV set-top box model soon and in the lead up to that launch, it has stopped selling the existing model. The landing page for the Fire TV now says it's "unavailable" and it lists no date for the device to return.
Recently, leaked images revealed a couple new Fire TV devices and it was claimed one of them will offer Alexa, effectively doubling as a smart speaker for your living room. Both systems are going to provide 4K and HDR support.
Amazon continues to sell refurbished Fire TV units.