Not NZ but in Malta it costs around 1-1.5mln eur. I imagine it could be more expensive than NZ as Malta's passport grants you free travel and work possibility across entire EU.
https://www.nytimes.com/2015/05/01/business/dealbook/malta-o...
https://www.nytimes.com/2015/05/01/business/dealbook/malta-o...
There are even some service that'll offer to "loan" you a property by buying at back for the price you bought it for after you got your residency.
Unsurprisingly, house prices in Lisbon and Porto have become unaffordable for the locals.