Hello, Vitvik,
Haven't done it myself, but other posters have suggested the following:
e-go, Transdirect, Smartsend and Packsend.
www.e-go.com.au/home.do;jsessionid=30DF988D1EBAA09939F5E9C1CFD7EE72
www.transdirect.com.au/
www.smartsend.com.au/
www.packsend.com.au/
One user recently reported that one of the above only acts via the Web and could not be contacted by 'phone. He had a lot of trouble with a shipment, but I can't remember which company it was.
Hope this helps.