Cheapest I've seen to date, I noticed this on a billboard outside of their store (see below). Description from the company's website:
Apple iPhone 4 32GB Model for sale.
In excellent condition, unlocked and ready to use.
Comes with USB Charging cable
Free Express postage Australia-wide.
Plenty of stock available, contact us for bulk discounts.
If you prefer to buy in store there's one on the city fringe at Woolloongabba (Brisbane).
These lagg insanely with iOS 7.0+
I would suggest getting a low end Android or even a Nexus 4 if the Refurb deal comes back from Expansys. But seriously, this is insanely bad with iOS 7.0+ a lot of crashes too.