You can now go directly to any of the big three credit agencies and get free annual reports right from them. I mean, if you want to be sure you're not getting scammed by some middle-man, why not just cut them out of the equation?
For some reason the only one of the big three agencies that's coming to my mind right now is Experian.
www.experian.com talks all about getting your free report, with a big "Start Now" button.