Hi Sarman,
Couldn't find any in australia yet but, I am sure there are a lot of people who know where to get them. Suzy and Ausastronomer (John) both seem to know where they would be (see earlier posts). But, they are sold at OPT in the states.
http://www.optcorp.com/product.aspx?...0-62-2684&tb=8
THat is the link for the famous 10mm (thinking seriously about it for myself)
Good luck.
Regards, Frank.