Inexpensive Two-factor authentication for a home server? [closed]

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I was considering adding some kind of two-factor authentication to my small home network of linux dedicated servers. I would need, maybe at absolute most, 10 physical devices. Are there any companies out there that would provide such a small order, for relatively cheap?

Thanks, Daniel

PS This is mainly for my own enjoyment of setting up of a system; I do not claim to function highly at-risk machines.

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Duo Security provides two-factor authentication for Unix systems: duo_unix. It is free for open source projects and installations with less than ten users.

Disclaimer, I am a Duo developer.

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Would you consider something like OPIE? (an S/KEY based OTP system). You should be able to set PAM up to require both a password and the OTP value, and most smartphones can run a generator.