As you might have guessed, THX 1138 is not available on DVD. If you think that this title should be on DVD, I encourage you to send a letter to the office of George Lucas. Let me know if you hear anything.
P.O. Box 2009
San Rafael, CA 94912
THX 1138 is © 1971 Warner Brothers, and © Lucasfilm Ltd. used without permission for non-commercial purposes.