It may be worthwhile contacting customs to see what you need to do. You should be able to get some sort of permit to import it if you can prove you have a license for it. Otherwise, if you just buy it, I expect that customs would probably seize it when it came in, but if you could prove you have the appropriate license, they would probably release it to you.
If you can only import something less than 1mW, I wouldn't bother as even 5mW is borderline on being useful, unless it is very dark.
I think there are some companies in Australia who still sell them, but you would probably have to prove you have a license?
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