Just a heads up: on the US Amazon site Feitian has a USB-A + NFC token for $16 (and there's a one-per-customer coupon on the amazon product page to knock it dow

Just a heads up: on the US Amazon site Feitian has a USB-A + NFC token for $16 (and there's a one-per-customer coupon on the amazon product page to knock it down to $10). Feitian also have a BLE + NFC + USB token for $24 (with a coupon to buy it for $16), but that requires charging a battery, is less rugged, and the USB requires a cable to connect to it. It's not as cheap as USB-only (there used to be a $6 USB token sold), but NFC support doesn't have to cost much more (especially as the secure element chips they're built around all move towards having NFC support as a baseline anyway). Also there seem to be a handful of Java Card implementations of U2F on github already (one of them is even sold as a Fidesmo app, if you want to pay for easy installation), so an NFC-only U2F token could presumably be had for as cheap as any javacard-compatible NFC smart card, and then just registered as a second token. I don't think it's enough to help push U2F forward by itself, but I think if webauthn can get solid cross-browser support for U2F implemented, price won't continue to be a big problem. Having just read up on webauthn, and seeing how many browsers already have test implementations shipping, I'm pretty optimistic U2F is going to be seeing a lot more interest soon.