I've been looking at buying this box set for a while now. Did a booko search and $39.95 with free shipping from Doubleday is the cheapest by about $15. For comparison I did a search on ozbargain for past prices and the cheapest it seems to have ever been was $34 pick up from Costco Melbourne before Christmas.
Booko search: http://booko.com.au/9780007477159/A-Game-of-Thrones-The-Stor…
Costco deal: http://www.ozbargain.com.au/node/84922
Just to clarify, '7 Volumes' does not mean all 7 planned books, a couple of them were split into smaller volumes. The Winds of Winter will probably be delayed for several more years and hell will freeze over before A Dream of Spring is completed.