Teacher Super Store

Great for texts and non fiction K-12

http://www.teachersuperstore.com.au/

Science Press

Also good for other subject areas
http://www.sciencepress.com.au/

Scholastic Learning Resources

Scholastic Australia

http://www.schoolessentials.com.au/LandingPage

Pearson Australia

Major publisher of texts in all subject areas, primary and secondary:
http://www.pearson.com.au/products/

ReadPLus

Probably got this on the blog somewhere but good to be reminded. A great site for Australian reviews and lists.

http://readplus.com.au/

Walker Books Classroom

Nice site for resource lists and general book news. Australian Curriculum based.

http://classroom.walkerbooks.com.au/home/

Reading Time

http://readingtime.com.au/

Reading Time Online replaces Reading Time in print and includes reviews, interviews with established and emerging authors and illustrators and reports from CBCA judges. You will also find booklists, articles on topics of interest to the children's book world, guest blog posts and more. 

Australian Children's Books

Review blogs and publisher websites for finding Australian Children's Books: The Book Chook