HN Business & Education has the Google Home for $159.20. Postage to NSW metro is $5.95. You also get a $50 HN gift card, which makes it a pretty sweet deal.
To access this site you need a membership from educational, government or private organisations. In other words, you can only browse the HN Business & Education store through AGL Rewards, TAFE, fitbit, RACQ, etc. websites.
P.S. I used the AGL Rewards site to get access.
Edit: Direct link to the deal http://www.harveynormanbusiness.com.au/electronics/computer-... Thanks to unity1