Slit film and reload your film cassettes. That's what I do. There are a number of people who make slitters. Some sell on eBay, others you can find by googling. Or you can make your own.
You just need to build up a supply of cassettes, which you can often buy cheap on eBay, with or without film in them. Expired film, vintage film, or empty cassettes. I bought a 10 pack of ACMEL expired color film for Minox once for very cheap, like $20. The film was no good, but the cassettes were well worth $2 each.
I process my own film, so I can easily retain and reuse my cassettes. If having someone else process your film, be sure to ask them first if they can open the cassette carefruly and return it with the prints.
One big advantage of slitting your own film and reloading cassettes is that you can use any film you like. Another one is cost. It's much cheaper than buying pre-packaged film. Then if you also process your own film, it gets downright cheap. But I have to admit that having someone else make prints for you is pretty nice.
