You have to scroll down on their Order form page to see the table of films they have and their cost. Not always cheap, but if you wanted to try an old camera, maybe it's worth it. I have bought 122 film (among other sizes) from them in the past.
JandC had a note on their website a while back (~2004) that they were working on either 116 or 616 film (I forget which). Does anyone know what happened to that project?