There are some quite cheap fido2 keys ( https://www.token2.com/shop/product/token2-t2f2-fido2-and-u2f-security-key https://www.token2.com/shop/product/token2-t2

There are some quite cheap fido2 keys ( https://www.token2.com/shop/product/token2-t2f2-fido2-and-u2f-security-key https://www.token2.com/shop/product/token2-t2f2-fido2-and-u2... ). But WebAuthn / Passkeys can also be provided by your android or ios phone. Or TPM -chip on a laptop.