Si I get a lot of camera straps building up because I get a lot of cameras in to review for YouTube. I've started selling all the straps I get that are in good enough condition to use. They're all $20, including U.S. shipping ($5 anywhere else in the world.)
Here are my first two successful astrotracked images with a film camera. The brighter image is a 15-minute astrotracked shot and the slightly darker one was either seven or nine minutes. Both were with the Pentax LX, SMC-M 50mm f/1.4, and Fuji Natura 1600.