Q: Where to get Pre-Paid iPhone 3GS in Australia? A: Vodafone!

You can find all the details here :) To start, outright prices are as follows:

8GB: $759
16GB: $929
32GB: $1129

The iPhone 3GS will be locked to Vodafone with the unlocking fees being as follows:

If iPhone is	And	Then charge is
Less than 6 months old	Unlock is via self-service on website	$75 dollars
	Customer care completes unlock request	$100 dollars
Older than 6 months	Unlock is via self-service on website	$25 dollars
	Customer care completes unlock request	$50 dollars

For more on unlocking iPhone on Vodafone, go here:

http://vodafone.custhelp.com/cgi-bin/vodafone.cfg/php/enduser/std_adp.php?p_faqid=2909

More details on the vodafone prepaid deal, here:
http://www.lifehacker.com.au/2009/06/vodafone-iphone-3gs-pricing-has-prepaid-tether-bundles/

Official Vodaphone Pre-Paid Prices are here:
http://www.vodafone.com.au/personal/iphone/3gspricing/index.htm

For store locations, visit:

http://www.nowwhereroute.com/Vodafone/StoreLocator/default.aspx