BiblicalTraining.org, the brain-child of President and founder, William Mounce, has been providing free, excellent audio resources for some time now. The goal of the site is in part,
"to help leaders in the local church become effective ministers of the Gospel by providing them with world-class, Christ-centered educational resources that will allow learning to take place in community."
The latest resource to become available is Douglas Moo's class on Romans, which he taught at Carolina Graduate School of Theology for a DMin Seminar in May 2012. One will find several hours worth of audio/video. One does need to sign up for an account with BiblicalTraining in order to access these video/audio files.