I found the 35mm Sandmar a couple years ago on eBay. The maximum aperture is f/4.5; it's a little slow, but it is coated and reasonably sharp. The C3 and the Sandmar always seem a good choice for shooting at car shows like the early Spring one I went to this morning in Old Town Albuquerque.
One of the two nearby Walgreen's Drugstores has stopped processing 35mm film. The other is due to shut down its Fuji machines in a couple days. It seems my C3 and I have come full circle.