I haven't seen any. You can still buy the Fuji, but you'll have to buy it from eBay or something similar. Like many people, I bought several boxes when they discontinued it, so it shouldn't be too hard to find, yet. Unlike the Polaroid film, the Fuji can be frozen which means if properly cared for, finding good stock should be possible for years to come, assuming you can afford it.
I know the Fuji Instax film can be loaded into 2x3 sheet film holders. My RB67 can use those, but I don't think the Hasselblad will. Even then you have to reinsert the film in a darkroom into an instax camera to develop it.
I actually bought a broken instax camera to try to make a back for the RB67 out of it, but was easily able to repair the camera, so I just decided to use that rather than break a working camera for a project.