The Samsung Galaxy S9 and Galaxy S9+ are new and exciting, but unfortunately this also makes them expensive. Thats why you may want to be on the lookout for deals such as this one in the US.
Samsung Galaxy S9
An S9 (Snapdragon 845, dual-SIM) goes for $670 available here while the S9+ (S845 again, dual-SIM) goes for $770. Thats down from the MSRP of $720 and $840 respectively.
Samsung Galaxy S9+
These are new factory unlocked units located in Florida. They are available in Midnight Black and Coral Blue.