Question regarding implementing two factor authentication.

I want to implement 2FA for at least one service I'm writing but I'm wondering, next to email, what services/implementations could I use?

I know that email isn't the best when it comes to security but I also don't want to force (a-technical) users to install an app specifically for 2FA so keeping email as an option as well.

But except for email, any ideas? Anything related to Google/facebook (prism integrated services) are a no go anyways (this has, as mentioned before, nothing to do with my ego or giving myself 'a pat on the back')

As for costs, I don't mind a little bit of money but the service will be free at first and I'm not rich :)

Looking forward to the comments!

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