Since the mention of a Subotnick DVD, I hit the web to see what it was about. There's a DVD on Amazon.com by "M. Subotnick" with no details so I don't know if that's THE Morton Subotnick.
But then I found a site I hadn't seen before at www.cdemusic.org that I had to pass on. They have a different Mort Subotnick DVD, but in general they seem to be a great resource for CDs spanning the history of electronic music, including a lot of stuff that is out of print from other sources.
Anyone ever ordered from these folks before...?