I am in Australia too and you can't beat free shipping from Hancocks of Paducah with up to 2 batting packs, sign up for their newletter and they will let you know the next time they have a free shipping offer.
http://www.hancocks-paducah.com/
Also Whittles fabrics prices are fantastic and their service is very fast, I had my order in 1 week,
http://www.whittlesfabrics.com/
I also have just ordered from wish upon a quilt and they replied very quickly to my emails, I have yet to receive my order but I only orderd it on Wednesday.
http://www.wishuponaquilt.com/
happy shopping :-D