Maxmax will post the filters if you ask them, or at least they did 6 months ago.
In Oz, you can get the similar, but better quality B&H 489 or 486 filters from
http://www.mainlinephoto.com.au/category19_1.htm
or
http://www.madsens.com.au/hoyacart/b+w/screw.htm
Also have a look at
http://www.iceinspace.com.au/forum/s...ad.php?t=15205