I'm pretty sure MLD charge $25 flat rate for an international delivery. It's a screaming bargain if you're buying a Mid, a bivy, a pot and a couple of small things. It's actually not too outrageous for a $59 pot, and I think you'll struggle to get any retailer to deliver cheaper. You could try advertising in Gear Swap for a used one.
The other option is to try to source something from the UK. Much MUCH cheaper postage. eg the Alpkit MYTI Mug (750 ml, 110g) is listed at GBP25, but when they knock VAT off, and add postage to Australia on, it comes out at less than GBP27 all up. Thats about NZ$56. I'm guessing NZ postage would be very similar.