We have dealt with
Urbanski films several times for supplies, and he has a good rep with us. That link is to his 8mm movie page.
HERE is a link to the supplies page, I highly recommend buying some FILMRENEW if you are going to be running old films. It keeps the celluloid supple, cleans the film surface, and lubricates the projector (yes, I've run problem films "wet" with this stuff!) really amazing stuff.
Have fun with the projector, man! And check in with all your extended family, someone is bound to have a few reels of home movies...