Warning, this subject is old (4197 days without answer)
Max_Power
To the best of my personal searching this movie is NOT out on DVD. The only place I've ever seen it is on MGM studios own HD premium cable channel. If somebody could set their DVR's for the next time it plays, the amount of 1970s vehicle nostalgia is amazing.
http://www.imdb.com/title/tt0073620/?ref_=fn_al_tt_1