I haven't checked the shipping prices on PCCG pre-built systems...
But you will generally be able to save a bit of dosh in terms of shipping going with EYO. http://www.eyo.com.au
I believe they charge a flat-rate $50 for system builds, you can choose either one of their specs, or your own.
Besides that, they also ship via Star-track. Which means you will have it overnight
I saved a good $100 buying a case from EYO rather than my initial choice of PC-case-gear. And it was all shipping costs.
i5 2500K @ 4GHz. Gigabyte Z68X GA-UD4-B3. Corsair 1600 DDR3 16GB RAM. Crucial m4 256GB. MSI GTX 680 Lightning II. ASUS Xonar Essence ST.