As above, I've been using protein direct for quite a while now. $87 for 2.5kg of WPI delivered, very quick delivery too.
If you get it with some mates you'll save more, and it all comes in 2.5kg bags so it's easy to bulk buy with a group of friends.
I will be buying 1kg from bulk nutrients to see how it compares to protein direct (taste/mixability) and if it's decent I'll probably grab 10kg of that.
For those putting a whole heap of thought into which protein to use, and buying certain types because so and so uses it and you want to look like them, you're wasting your time.
Basically find one with a good protein % per serve, as little sugar/carbs etc in it (unless you want carbs obviously) and at a decent price.