True Saleen seats are made of unobtainium and are incredibly expensive when they come up on eBay. Flofits and Recaros without the Saleen emblems, different material and different headrests are available fairly reasonably, but real Saleen stuff is very hard to come by without the car attached.
Check out Seat Source. They still sell the Flofit seats. Just FYI, you cannot get the Saleen style halo/mesh headrests anymore. Also of note, the Flofits are an inexpensive (read: cheap) aftermarket seat. I have found that they are of good quality, but they are made overseas, and not as good as Recaros for example. Saleen did not always use the best stuff available on their cars. It was more like what could be sourced, inexpensively in mass quantity. For example, the Flofit seats, cheapest Hurst shifter made etc. etc. Here's a link: Seat Source > Home