Here's a list of a few of my favorite Australian felt wool online stores to add to the mix:
Glenora wool and weaving - http://www.glenoraweaving.com.au
I've used a wide range of felt wooltops and Glenora wool and weaving are probably the best - the fibres are always super clean (which may not sound like a big deal but I have brought some wool tops still with 'bits' of grass in them, they have a range of basic to advanced colours (they pretty much have every colour in solids and a lot in mixed colours) and very easy to work with. Christine has great customer service!!
Fibre Fusion - http://www.fibrefusion.com.au Lovely range of colours from gorgeous pastels to brights. They also have really gorgeous pre-felts.
Treetop colour harmonies - http://www.treetopscolours.com.au
A fantastic colour palette like no other! Lots of great bright colours in the wooltops but also in a range of silks for nuno felting.
Fibre Dyeversity - http://www.fibredyeversity.com.au You'll be surprised looking at the website but when I was hunting high and low for a large quantity of pure pure white fine wooltop they were the ones who had it!