The movie is available on DVD as "Pictures at an Exhibition Collectors Edition."
The disc is double sided with the movie on A and the soundtrack only on B.
From D2 Vision LTD/Favourite TV Inc.
Information from Amazon.com (where they state it is discontinued but several are available used for $12)
This version is what I saw in the theaters but the DVD seems to be missing parts of the performance. Worth it for ELP fans to get a very early look at the band.
Bill