The new iPhone X will be limited in supply until the end of this year so you may have to wait until next year to get your hands on it.
Reports of the iPhone X's manufacturing demands were plenty before its release and so to make things easier features such as TouchID are being removed. This gives us the idea that supply issues will continue once the first batch of iPhone X's is sold out.
According to a report from the tech analyst Ming-Chi Kuo estimates the 2017 shipments to around be with 40 million which is down from a normal high of 50 million but 2018 shipments will be around 80-90 million.
The current iPhone X's production amounts up to just 10,000 units per day which is not enough to meet its high demand. But those are probably going to increase with time particularly as the phone is only available in just Space Grey and Silver.
Source: Link