I could not see a link on either such institution's website for sales of film. Film for Classics now only sells through dealers, and B&H stocks their 116 film, but at $25/roll, no thank you.
If the information is not available on the web, I will guesstimate it. I know the film is 70mm wide. I can extrapolate from overall length of backing paper how much lead-in and lead-out I need, and I will calculate where the numbers should be placed.
Thanks especially to MattKing above for the helpful comments.