There is a $50 Customs fee for the privilege of paying the GST. I had to go to the Aust Post Customs centre at Chullora about 5 years ago to do the paperwork on a camera purchase. I paid the GST & fee together. Around the same time I bought a lens from B&H that came by UPS. They called me when it arrived in Sydney as they were clearing it through Customs. From memory it was the same as I would have paid direct. I have heard stories of some courier forms adding their own exorbitant clearing fees; one reason I avoid FedEx. Under $1k via post is the simplest way to do it.