Really?? I tend to find the opposite, hardly ever see a naked ones about but quite a few faired ones up for sale locally.
Suppose it depends where you are based, I've just done a quick search on gumtree and there are mainly faired ones for sale, 2 Black ones too but quite high mileage.
Bit if that is the case then would it not make more sense to buy a colour FZ1S and spray it black rather than to try and add fairing to an N?