I have used Yubico's U2F key since shortly after they came out (Nov 2014). They are very robust and relatively cheap. Moreover, in contrast to some cheaper keys, they require physical confirmation by a finger press.

Feitian NFC-compatible is nice because you can set up your Google Account on an Android phone with it: https://www.amazon.com/gp/aw/d/B01M1R5LRD/

If you're into cryptocurrency, the Trezor will also act as a U2F device.