Optus and Vodafone have released their upcoming pricing for the iPhone 4s due for release in Australia Oct 14. The device will be available on Optus on its $49, $59, $79 and $99 plans with those on the $79 plan and above paying no extra for the handset, see here for all the details.
Vodafone will sell the phone on their $29, $49, $59, $79 and their infinite plan, you can find all the details of their plans here.
Despite the media circus surrounding the iPhone 4s launch being underwhelming, all the Telcos both here and abroad are reporting an precedented demand for the device.