Sadly, NZ Post have increased their postage as from July 1, 2016, and so unfortunately I have to pass this cost on to you.
Postage costs within New Zealand increase from $1.60 to $2.00.
Postage costs to Australia increase from $2.00 to $2.20.
Seems that postage cost are going up every year, which is a bit of a shame.
The good news is that you still get free postage if you spend over $10!! Start shopping!