I have secured cheaper shipping with Fastway Couriers. 

To all (actually, most) of Australia:

$15 for up to 10kg

$30 for up to 20kg 

Please note that whilst every effort has been made to keep costs down, shipping costs to rural or remote areas may be higher than those quoted and the order may need to be adjusted. 

I am trying to get the cheapest price for shipping so please email me for a precise quote if you think the prices above aren't appropriate. I will, however,  always try to send by the cheapest way depending on your order. 

If anyone has any other ideas about saving on shipping costs,  please let me know.