FIDO2 U2F Security Key - U2F USB 2-Step Authentication Security : ID 3363 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: FIDO U2F Security Key, Thetis [Aluminum Folding Design] Universal Two Factor Authentication USB (Type A) for Extra Protection in Windows/Linux/Mac OS, Gmail, Facebook, Dropbox, SalesForce, GitHub : Electronics
Yubico Yubikey Security Key NFC,Two Factor Authentication USB and NFC – FIDO U2F and FIDO2 Certified - AliExpress
FEITIAN ePass FIDO2-NFC Plus USB-A Security Key with PIV | K9 Plus – FEITIAN Technologies US