Lowest price according to camelcamelcamel $289.99 + $7.08 estimated shipping (total approx. AUD 348.75)
Features
•New! 4.0 GHz base frequency
•4 Cores, 8 Threads
•Fully unlocked for performance tuning
•Intel® Turbo Boost Technology 2.0
•Intel® Hyper-Threading Technology
•Intel® HD Graphics 4600 (1250 MHz)
•Supports LGA 1150 socket
•8 MB Intel® Smart Cache
•2 channel DDR3-1600 memory support
•16 PCI Express* 3.0 lanes
$399 delivered (by Kogan) is about as good as you'll find it locally (unless you can get free shipping). MSY have it for that price in store too. So the discount of $50 isn't too bad.
That said, I'm a bit iffy about online — especially international — pc hardware purchases; too many RMAs in my past to not buy from somewhere I can walk into.