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Here is a place that sells film for your camera. I would suggest you or a professional check out the shutter, etc. and make sure it works before running film through it. As you can see, it will save you close to 200 dollars if the camera turns out to be damaged or defective.
http://www.bhphotovideo.com/c/product/635730-USA/Kodak_1382688_Vision3_250D_7207_16mm.html
B&H deals with a bunch of professionals, including the major news networks for their supplies. They have a bunch of film related stuff on their site too. Matte boxes, filters, tripods. Even a budget Steadycam type camera stabilizer. Good luck and have fun with that camera. I owned an old Bell and Howell years ago and sold it cheap only to find the thing was worth BIG money later on! Still mad at myself for that one ...