Kind of on a related note. I did get a 100 foot roll of NEGATIVE Double-X 16mm Single-Perf film for my little 16mm still cameras (Minolta 16 etc). It was $22.51.
I'm just finishing up a 100 foot rool of HP5 negative 16mm single perf that I got in 2001. A little goes a long way in those tiny cameras. I'm planning on getting a Minox splitter for the 16mm so I can go through the film faster. My ten-year old HP5 is pretty fogged.