As far as I know, yes they are still being sold.
I just had my SA saddle re-covered (in June) -- I "purchased" the refurbishing service online, packed up the saddle, and sent it off to their factory. Got it back in about 10 days. I would imagine you could purchase a complete saddle from their website the same way.
Plus, if you do a search, there are still plenty in stock at various online retailers.