https://www.bleepingcomputer.com/news/google/googles-fido-based-titan-security-key-now-available-for-50-usd/

Last month, Google announced their Titan Security Key - a FIDO based security key that allows you to easily perform 2-step verification with compatible devices, browsers, and sites. While previously only available to Google Cloud users, Google has now made the key available to U.S. customers for $50 through the Google Play Store.

When you purchase Google's Titan Security Key, you will get both a USB and a bluetooth key. The USB security key can be plugged directly into a USB port and provides automatic 2-step verification when using Android, Chromebooks, or computers running Chrome. The bluetooth key allows a wider range of compatibility with devices that do not have a USB port, such as an iPhone.