How can I acquire a copy of the original video from Frank Zappa's 1977 halloween concert?

I have the "Baby Snakes" DVD, but is there a movie of the entire
concert from start to finish (without "interruptions" such as back
stage activities and animations)?
The original 168-minute?
I can't seem to find anything about it online. I live in Norway, so
purchases from sites like Ebay, Amazon etc. must include delivery to
Norway.

Any leads would be much appreciated.
In advance thank you!