You can shoot 48fps max by now, and slow it down 2 times with something like twixtor or optic flow... this way you will get a result like it was shot in 96 fps. Sometimes it would work, sometimes not.
If there is a lot of fast motion in a frame, then twixtor won't help. But even then, if you only need two seconds of slow-motion, then you can probably get away with it, just select the part without artifacts, it could work even if it was a very dynamic scene.
