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.
Enjoy! :)
If the above is all too hard you can get the game on the NZ Microsoft store for $25 (Also 75% off).
PS: No VPN needed to do this.