Free credit monitoring by Credit Karma is offering a added credit monitoring service (about 900 invites remaining) for free

This added benefit to the already free service that Credit karma provides

I've been using CreditKarma for the last 3 years and it is one of the best free credit score sites available. They send you very little if at all messages and no credit card is needed for signup.

Credit Karma uses a score based off of Transunion and although its not your true FICO score it is in general around the same range.