Two Form Factor Authentication for AD domain

Hello Experts,

Can anyone recommend some relatively cheap and simple 2FF authentication providers for integration with a Microsoft domain?

I'm expecting to re-sell/install this into all of my clients systems, which include SBS 2008, SBS 2011 as well as "proper" 2008/2012 domains, ranging from 5 user to 55, hence the "relatively cheap" above...  Not main providers seem to have prices online so before I start evaluating I'm hoping you can steer me in the best direction based on experience.

Thank you,

TC
TopCat-007Asked:
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Russ SuterCommented:
I use Duo Security (www.duosecurity.com) for all multi factor authentication. It's free for up to 10 users and only as little as $1 per month per user if you need more than 10. It's also very easy to use, configure, and manage.

Instructions on how to integrate it with any LDAP system found here: https://www.duosecurity.com/docs/ldap
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Rich RumbleSecurity SamuraiCommented:
Remember that 2-factor only helps cut down on sharing logins, and interactive logons. Once authenticated, doing \\server\share and connecting to domain resources are not stopped by 2fa.
http://www.experts-exchange.com/articles/12368/Two-Factor-Authentication-Added-layers-are-not-always-added-security.html
-rich
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