This is hardly a new topic, as there is a whole thread on the book itself, as I recall. However, if you are determined, be prepared to pay a lot for it! I bought my copy from the publisher- Russky Aniquariate in St Petersburg. It is a very heavy 2 volume boxed set but as I carried it home myself I did not pay shipping. There is also a source in the UK that might have a copy or two, but I am not on good terms with the, You can check availability through Bookfinder.com. In both cases the the cost was about $300 US. Shipping is considerable, especially to Australia, I imagine. In any case avoid at all costs a US site that advertises it, or used to. Several of us on the forum have tried to usem them, all with frustrating results.
You can pm me if you wish more details, as I want to avoid endorsing any one source on the public forum.