Becextech is selling the iPhone 4 16 GB for $624 with a 1 year Australian Warranty. I'm pretty sure that's one of the cheapest deals out there so far. It doesn't mention the postage as far as I know which might be the catch.
I also found the 32 GB iPhone 4 with priority delivery and a 'free accessory' that isn't mentioned apparently.
This is my first post. :)
Mod: Postage appears to be $74.95 for "Express Courier/Express Post" (only postage option).
:O Good first post! I would never pay this much for an iPhone 4, just because i'd prefer an android phone at this price, but it's a good deal for people who want an iPhone4.