The Polaroid 250 Automatic will work with Fujifilm FP100C. Fuji also have a B/W version of that, and an ISO 3000 (high speed, low light) film that will work. Similar old Polaroid cameras to that are the 100 Automatic, 350, 360, and 450 . . . with little difference between them, other than flash type or battery. If you had a bigger budget, you could try to find a Polaroid 180, which uses a manually set shutter speed and aperture.
There is also the Polaroid 405 film holder, which can use current Fujifilm instant peel apart films. These backs will fit many large format (4x5) cameras. There is also a Polaroid 550 film holder, and Fuji makes FP100C45 just to fit that back; also works on many 4x5 cameras.
Fujifilm sell their Instax cameras in Japan. These are not peel apart films, instead each shot simply comes out of the camera after you push the shutter. While these seem like the Polaroid cameras that take the 600 films, they are not croxx compatible.
Ciao!
Gordon Moat Photography