Google has released three colour variants of the Pixel 4 and Pixel 4 XL so far, but a fourth has appeared on a Chinese auction site. Adorned in a matte grey finish, the device can be had for CNY 2,699, equivalent to around US$380.
https://www.notebookcheck.net/Really-Gray-The-Google-Pixel-4-XL-has-never-been-seen-like-this.464336.0.html