R30 in audio form?

I recently purchased the R40 DVD box set with all of the recent concerts, but there is one thing I am concerned about. If I ever wanted to have the R30 show in audio form someday, is there a way to acquire it without buying the deluxe set that has the show in both DVD and CD form? I don't want two copies of the R30 show on DVD, because I am already getting it with the R40 box.