Well SpeedCubeShop is really one of the more expensive shops, especially when shipping to Australia.
If you are only ordering a WitTwo, then an Asian wholesale store would be a good option as most of them have free shipping. Chinese brands/stores often don't have great reputations, but sites like Lightake and Dinodirect are well known and are very trustworthy. You still want to be careful which store you order from though. PickEgg/FadBus/GreatSku, for example, is not really very trusted.
Likiti/DealMaz is also a cheap and reliable store.
If you are ordering a larger order, The Cubicle is great becuase they have free shipping on $50+ orders as well as fast processing and shipping.
Check out
this thread when looking to purchase new cubes.
edit: Just saw your post about DinoDirect. Oh well, I'll leave this post here because it should still be useful (to someone).