Coyote Instant Film Back for Mamiya RB67
This is pretty neat. If you have an RB67, the Coyote Camera Works Instax film back lets you shoot square or Instax Mini format pretty seamlessly. It seems to work really well.
Sealing and repair kits for film cameras
Just a note to myself that when it comes time to repair my Mamiya RB67, I can buy the foam seals here.