The 5G version of the Pixel 4a launched in just one color: black. Unless, of course, you went with the Verizon-exclusive white option instead. However, Google has now announced it is releasing unlocked SKUs of device in both colors from January 28, 2021.
https://www.notebookcheck.net/Google-s-Clearly-White-color-option-is-coming-to-the-non-Verizon-Pixel-4a-5G.514086.0.html
Google entered the smartphones competition without any intentions to win and also not to survive. It's really shame. If it wasn't for Google, the phones would likely stop dead at Pixel 2.