FIDO2

Next generation of U2F security keys

There are several new FIDO2 compliant security keys. These will become essential to protecting your online presence. More and more services are supporting their use in 2 factor authentication.

Solo, opensource FIDO2 project

I used the U2FZero open source project to experiment with making my own U2F key. Their second generation key will support FIDO2 and they will also have a version with NFC. You can back their project on kickstarter. These are the cheapest available, if you can wait.
https://www.kickstarter.com/projects/conorpatrick/solo-the-first-open-source-fido2-security-key-usb

Google Titan bundle

These look a lot like the Feitian U2F keys I have. But these support FIDO2. They sell it as a set of a bluetooth dongle and a NFC USB key. They recommend having 2 keys, one as a backup.

Yubico Series 5 Keys

Yubico keys can do more than U2F and FIDO2, they support additional protocols. The new Series 5 keys add FIDO2 support. There is a lower cost version that only does U2F and FIDO2.