YK18EG
Yubico is offering 20% off various products in their store.
Currently the best option for account security if a website offers support. There is an Android app to support normal Time based 2FA(TOTP) which can be unlocked via NFC.
It's recommended to purchase 2 and set them both up and safely/securely store the spare.
You can order up to 3 'individual' keys, just add them separately to your cart. (not as a pack)
The NFC version is ideal for use with mobile devices.