The Yubico Security Key C NFC doesn't have all the bells and whistles of its YubiKey cousins, but it works for most MFA scenarios people will encounter and comes at a very affordable price.
The Nitrokey FIDO2 offers multifactor authentication at a reasonable price. It employs open-source hardware and firmware, but it lacks NFC as well as the encryption features from other Nitrokey products.
Multifactor authentication is the best way to prevent account takeovers, and the tiny fingerprint-reading Kensington VeriMark Guard USB-C Fingerprint Key is up to the task. You don't get advanced features such as NFC connectivity, however.