The Astronomik HaLRGB set is a
[pending sale] now.
**The FLI LRGB 50mm unmounted Research Grade set is still available:
Some may not be as familiar with the FLI filters but the FLI filters are as good or better than other top brand imaging filters on the market like Baader or Astrodon etc. I used them when I got my first FLI camera and had no issues with them at all. I then obtained an Astronomik Ha filter which is a different thickness to the FLI's. After a while I wanted all the filters to all be parfocal so I got the rest of the Astronomiks as at the time FLI wasn't offering other narrow band filters.
In case you may be needing a quality set of LRGB filters the FLI set is of the highest quality and now FLI offer the whole set of narrowband filters too if you want to move that way in the future and maintain par focal-ness. They will fit in any filterwheel that can take 50mm round filters.
For AU$500 you have a bargain set of high quality CCD filters
For full specifications see (RG 50D LRGB):
http://www.flicamera.com/fli/filters.html
Here is an award winning image done with the FLI filters
http://www.pbase.com/strongmanmike20...12510/original
and another but non award winning image.
http://www.pbase.com/strongmanmike20...96023/original
Cheers
Mike