Two years ago, At a local photo show, a Minox IIIs in good serviceable shape, for $40, with case and measure chain. Lots of expense and work to obtain cassettes, build a slitter, modify an old Yankee developing reel, and sew up 120 Clear File pages to take the negatives. But it is an amazing little camera. At 2.5 oz, slips in a shirt pocket, (or belt pouch made for small pocket knife) and, so far, the film I'm using, Ilford Pan F, is the limiting factor to resolution. Just have to get some bulk film, I'm thinking Ilford Delta 100 will be a good compromise for speed/resolution.
This was an impulse buy. I had always considered 8X11 subminiature just too much trouble and expense for such a small neg. But surprisingly it has been a fun trip and I marvel that so much practical design is contained in such a small package. And that lens! Just amazing.