You buy the film, you get a loader, you load the film into it in total darkness, and then you roll the film into cartridges. Each can gives you the equivalent of 20 rolls x 36 shots.
I have Velvia 100 for sale. This is the best film for landscapes out there, period. It also works well for general shots. $120 if you want just the can, or $140 incl. rolling into canisters. PM me if interested.