Amen to that,
Ive had similar problems trying to get the weapons. After much searching it came down to kids toys.
A friend in the States sent me a toy shotgun and 44 magnum from Kapowwe.com and they will do until i can
come up with something else, its very hard to find even the stock of a shotgun, but thats the plan. Here is the toy shotgun and
minor mods i made, not great but does the job for now.

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I also found a source for fake police batons that are pretty accurate, dirt cheap and legal. Heres a pic and the link.

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http://cgi.ebay.co.uk/Police-cop-copper-baton-truncheon-costume-accessory-21_W0QQitemZ350310872677QQcmdZYou can also get accurate three link cheap handcuffs from Ebay UK.
Hope this helps anyone in Oz needing to get some gear together, legally.