Projectors - Belts
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McMaster Carr 
Santa Fe Springs, California
United States
Search for "Belts" or "Urethane Belts".
Russell Industries 
http://www.russellind.com/prbline/index.html
Lynbrook, New York
United States
Sells the PRB Line of belts
Van Eck Video Services 
Tilburg, Netherlands
Rental and repair of many different make and models of 16mm projectors, and manufacturers some projector parts. Also sells a number of projector manuals.
Wittner Cinetec 
http://www.wittnercinetec.com/
Ammersbek, Germany
Sells film stock, including Wittner Chrome 200 ASA, test films and numerous film handling and editing supplies