As I understand the aquarium market at the moment; the largest sales ($) are in the saltwater fish and product sales. Planted aquariums are growing, but they are still behind the salties.
That's why you see many fixtures with saltwater bulbs, I believe.
I believe that I have 1 used 50/50 Actinic/10,000K 28w bulb and 1 40w and 1 65w dual 420nm & 460 nm actinic Current-USA bulbs. The last two bulbs are new. All of these are for sale. http://current-usa.com/sunpaq.html