I have seen a few sell in QLD in the past 6 to 18 months for between $6,000 and $8,000 absolute tops.(more so closer to the 6500 mark)
The market has moved dramatically on these late B/W titles and because so many have been brought in from so many container importers, it has dropped the price down considerably.

I think the prices in VIC are a little higher compared to other states from past history etc. 3 or 4 years ago these titles were impossible to find, but not anymore. Dont overpay because u will find it impossible to get your money back.