According to this press release from the Sydney Opera House, it'll only be available at the Opera House shop, David Jones, Myer and Toys’R’Us and online via LEGO.com.
http://www.sydneyoperahouse.com/lego_creator.aspx
I ordered the 41999 yesterday when it briefly entered the lego online store again. However I have just discovered that this has been cancelled coz they're out of stock :( Bummer. There's no way I'm paying after market prices for this set though.
Anyone have any recommendations on Lego stuff to see in Melbourne, or Lego stores to visit? Do the Lego educational centres sell Lego or is it only on their website? Thanks in advance.