I'm going to take a risk and assume you mean shooting 35mm film for a motion picture. Your least expensive option is likely to rent an ARRI 235 or 435. I have seen the 435 for as low as $250US per day. That price does not include the PL mount lens(es). A single roll of Kodak 35mm Vision 3 will run you more than $300. Adorama has Foma Film Fomapan 400 B&W for $55US per 100 foot roll, but it is currently on back order. AND it's black and white film from the Czech Republic. You can occasionally find new old stock 35mm film on ebay, but beware and only buy from trusted sellers. THEN, even after you've shot your film, the cost doesn't stop there. You have to send the off to be developed. That is charged by the foot. After you get your developed film back, you have to edit it. If you don't have access to a Moviola, you will have to find someplace to edit your project. As you can see, renting the camera itself is the least expensive part of this process.