Works perfectly; I'm just not shooting any instant film. This is the more desirable NPC version, with the handy darkslide holder (keeps you from setting the darkslide down and then sitting on it).
$US 35 plus shipping; I'll cover PayPal fees.
I’ve used it with Fuji FP-100C, which you can still find. There may be new iterations from other manufacturers, but once Fuji stopped making B&W pack film in a speed that mirrored my negative film (I used the back almost exclusively for studio lighting tests), I bought a used DSLR for said purposes and stopped paying attention to the instant film offerings.