Don't know about the SG price for SFX-200, why not just call Ruby and ask them?
I'd be wary of buying film out of the states unless it's in commercial quantities because everything that is being posted these days is being X-rayed to bits by the post office dweebs and their ilk in the name of Global Paranoia in the alleged war against terrorism.
I have no idea for other cameras, but for most (if not all) Canon EOS cameras have a quirk with IR film. They don't cause the film to be overexposed, but because they use an IR mechanism to count the number of frames, they will fog the bottom of the IR film.
You camera manual should state that whether it can accept IR film or not. At least for my EOS 300 it does state that IR film is not recommended for use in this camera.
And if I'm not wrong, however, it only affects certain brands of IR films. Search the Internet for more details on this.