Here are several sites that you can order Godspell "stuff" from:
Pepper Music carries several pieces of Godspell music, including the vocal score, as well as two different vocal selections books.
At Amazon.com, you can order several different soundtracks and also the movie Godspell.
Bottomdollar tells you where you can find stuff at the lowest price. They have links to sites where you can purchase the Godspell video and also the soundrack.
You can find the video at BigStar, too!
I hope you find what you need at these sites!