B&H still has the 100B, I just ordered 5 packs, along with 5 packs of the 100C (it is at the lowest price I've seen in a loooong time right now).

As for TiP, I'm all for them taking over if Fuji decide to leave the game, but I sure hope they take along at least a couple engineers from Fuji with the equipment. My one bone with them is that they still have not figured out how to make their instant film light insensitive once it comes out of the camera. This may not be an issue with pack film, but for the films they are making now, it is the one reason I refuse to bother with it at all.