http://www.zerelda.com/international...ionalfilm.html ... mr schwind might sell 16mm i know he sells 8mm ...

and while prep film services in michigan doesn't have a website anymore (i think?)
http://web.archive.org/web/200709060.../prepfilm.com/
the wayback machine has info on what they USED TO sell + process ...
their facebook page is still active
https://www.facebook.com/pages/Prep-...04188319647745
so it might be worth a call to see if he is still actively selling 16mm film stock
when i was actively shooting 8mm ( and a little 16 ) i used to buy my film from him ...
( i used to have it processed by fujilabs through walmart for $5 )