Well as K2 own line, i'm thinking that they would be distributed by the same company.
Bentley sports distribute K2 for Australia, so a phonecall to them could help, or you could just speak to any K2 retailer. Same goes with Salomon skis and Amer Sports.
The only problem with special orders is you will pay full RRP.
Yeah shipping from the US will run you over US$100 at the BEST of times. Often much more.
If you buy from a US shop they often have volume discounts with courier companies (UPS/FedeX/DHL etc)..without that (i.e buying from an individual) you are looking at over US$200 on shipping alone.
Plus there are restrictions on some brands.
Shipping won't be that expensive from the US. From the US to New Zealand is US$63 through USPS and it costs more if you get it through a store. So it would be a similar price to Australia. You'll have to check with customs though to see if the total price will be over the limit for calculating GST and if there is an import duty on skis.