AusBonsai

Check out the facebook of Imperial Bonsai Hire. I think he ha the one in the profile pic for sale. It is about 35 years old grown from seed. Shoot him an email... I have seen it in person and its probably one of the best ones in Vic. Off memory, it was not cheap as he said he paid an arm and two legs for her. hey, life's short and has an expiry date...

I have seen some nice imported maples but the length of time needed in quarantine can be a concern for the trees health, not to mention the expense.
It would need to be a special tree before you would consider importing.