Sending a box from Oz to NZ... suggestions?

[Steam]

I just looked on the Australia Post website and to send a 20kg box back here to Dunedin will cost $170 NZ dollars! It's my stuff from my aborted motorcycle tour around Oz.
There must be a cheaper way, surely?

Interestingly, to send from NZ to anywhere in Oz only costs $72 NZD for the same weight and size! Cheap.

Anyone know of a cheaper way than Australian Post, maybe a freight company who do slow and cheap sea shipping of single boxes? My stuff is in the smallish town of Mt Isa.

[scracha]

Try TNT. I would use Aus post again if you paid me.