Any goods over $1000 get GST as well as some import tax.
When GST was first introduced here domestically, I thought it would kill off business for awhile, but didnt really only increased the amount of people wanting to pay cash and not record a transaction. Which was OK on small jobs (im a plumber BTW), but wasnt really doable on larger jobs because you could get audited and would have to justify money going out for materials and why you had a big boat in the driveway and very little income. But the biggest pain was the extra bookwork, I had to collect the GST and pay the government quarterly (still do), initially wasnt too bad, take about a half day and could do your self, eventually they made it so complicated I had to pay for an accountant to do it for me. Im just a small one man operation, imagine how much of a head ache it is for larger business. Cant imagine too many overseas companies wanting the extra workload for small volume sales.