I have an fixture for sale, its 24" though:

Its a Oddessey fixture, thats had a fan replacement and has a new ballast. The ballast is an Icecap and is a 2007 model. It has 2x65w PC's as well with 1 original bulb in it and 1 UVL super actinic thats 2 months old. The current bulb is an Xm 10k and has 1 month on and off use on it. And I have a Phoenix 14k backup bulb with about 7 months on it. I am looking for 200$