For the reasons of economy, I normally use Transdirect which is a shipping aggregator offering services of all major couriers operating in Australia. For more urgent or sensitive or high value shipments, I select TNT and their Technology-Sensitive Express Service.
All shipments from me are fully insured and I ask my clients to also insure items sent to me.
The cost of shipment of an average CD player to the major centre on the East Coast is about $25-$30 each way. Or double that if TNT is selected as a carrier.

To estimate the cost of shipping to your destination, go to www.transdirect.com.au
and enter the following in appropriate fields:
Suburb: WANNEROO (6065)
Building type: RESIDENTIAL
and then details of your address.
Please use weight and dimensions as specified under each individual item listing.