Ping Steve of MyAstro in Harbord - he stocks them - is at least as helpful (and cheaper) than the talented folk at AO - he may have leads for you.
http://www.myastroshop.com.au/
Also a few guys in Cloudy nights in the USA have them - e.g.
http://www.cloudynights.com/ubbthrea.../1#Post2168576