Iv'e been wanting to convert some of my old polaroids to Instax wide for a while now. What alternatives of Instax backs is out there? I know about the Belair Instant Back but that's been out of stock for a couple of years now. Isn't there anything else out there? The market for a ~50$ back and easy to mod must be huge, or am i completely wrong? There is a kickstarter up for a back but they want over 200$ and for that price I can by a brand new camera and rip out the back myself and have some change to spare.