Instructions
Contact your local camera store. Begin with the larger chain stores and see if they have any old supply of 110mm film or if they know of any local photographer who may have old inventory. Independent photo stores are also a good point of contact. Let the retailers know that you are interested in buying the film and leave your contact information.
Contact local university, community colleges and even high schools if they have a photography course. Ask if they have any old stock or if they are still using the film and where they source it from.
Access the Internet and go to photography forum sites that cater to film photographers. There are a number of these sites on the Internet; two of the largest are APUG (Analogue Photography Users Group) and Rangefinder Forum. They may also have information about 110mm film.
Post an online ad on the sites listed above and other film-based photography sites indicating you are interested in purchasing 110mm film.
Contact Kodak and Fuji directly through their websites and see if they are still producing the film and if you can buy directly from them.