A bit of jiggery-pokery to get this one working but well worth it…
You will need a USA paypal account for this which is quick and free to set up at www.paypal.com.
Use your US Youshop address when setting this up (or the address of a US hotel or something).
Transfer 5 USD into your new US Paypal account
When going to the link select to stay in the US store and use your new US paypal account to pay.
If the above is all too hard you can get the game on the NZ Microsoft store for $25 (Also 75% off).