Parcels up to and including 500g cost $6.60 Australia wide.

Parcels 501g+ depend on postcode.

Parcel Post Satchels up to and including 500g cost $7.85 and include tracking.

New parcel rates for 500g and over come into effect on 5th November.

http://auspost.com.au/about-us/price-service-changes-5-november-2012.html