Dare I say it: Try your local movie theater. Despite being deep into home theater I still go to the cinema and was able to get some empty 35mm 20min reels for free. I've seen the exact same beign sold for $100-$150. If you get to know the projectionist you might even chance upon an extra "Dolby Digtal" or This theater equiped with DTS" sign.
Better still, if you hear of a cinema closing down, make a bee-line for it. They tore one down recently which I was too late for. I found out from a guy that they threw away some stuff that would have made brilliant decorations.
[This message has been edited by Brian Florian (edited January 15, 2000).]
Brian Florian - AV Technical Writer and Consultant.