Bob, have a look on ebay and find one that ships from within Australia.
Check your local laws.
In NSW if you're a member of a recognised Astro Society and it's 1mW or less then you're allowed to use it for astro.
The better ones are the 515-520nm green as they're not as sensitive to cold conditions, different diode to the 532nm.
The 532nm ones are more common, cheaper and more susceptible to the adverse cold at night but if you keep them in your pocket to keep them warm between uses then they're good to go.
Here's one I found when I did a quick search on ebay.
https://www.ebay.com.au/itm/33394209...AAAOSwXDhgZHjx
Do your research and obviously be careful and mindful of aircraft in your area when using one.
RB