Todd's Hifi has 10% off Sonos for boxing day.
Deal isn't as good as the now expired https://www.ozbargain.com.au/node/170397, however it does include the Connect and Connect:amp, which I haven't seen go on sale before.
Connect $494.10 (usually $549.00)
Connect:amp $719.10 (usually $799.00)
Shipping worked out to be ~$30 to Sydney for 4 of them.
The website also says you need to ring for availability, but after ringing the store, they said it's fine to just process the order through the website with delivery occurring when stock is replaced.
I think if you are buying a system then you are better off going to jb or HN and negotiating.