https://www.cnet.com/news/you-can-buy-googles-50-set-of-security-keys-now/

Google just made its Titan security keys available on its store.

The $50 set comes with both the USB and Bluetooth versions of the Titan security key. CNET got an exclusive hands-on with the Titan keys when Google announced them in July and we tested them out with Gmail, Twitter and Facebook accounts.