The iPhone X has been sold out since the phone went on preorder in late October, but Apple has been ramping up production significantly to meet demand. Right now, you can order an iPhone X directly from Apple and have it shipped to your home in a matter of days.
However, Apple has reportedly cut iPhone X orders for the first quarter of 2018, as demand is supposedly fading.
The report quotes notes from analysts who have already lowered iPhone X shipment projections for the first quarter of 2018, citing a lackluster demand at the end of the holiday shopping season.