For sale is an Adapt-A-Roll 620 6x9 film holder in original box with instructions and rare 6x6 dark slide. You can shoot 6x9 images or insert the 6x6 shorty darkslide and shoot 6x6 images. The AAR 620 takes 620 film but you can feed 120 without a problem and I've included 3 620 reels for the take-up side. I haven't shot it in a while but last time I did it worked just fine.
Asking $50 plus $11 shipping in the US, international shipping more. PayPal or MO gladly accepted.
I have one of these (with the box, instructions, ground glass pencil mark guides, and 6x6 darkslide as well). I paid about as much for it. Track down a bunch of 620 reels for the take up side, and you can shoot medium format film in your 4x5 spring back camera (no need for a Graflok back). I'd like to get this one too, but can't justify it.