Amazon Prime Video has just launched in a number of countries including NZ.
Sign up for a 7 day free trial, then enjoy the first 6 months for $2.99 USD per month, with the price reverting back to $5.99 after 6 months.
The link is a Geekzone (source of the deal) affiliate link, feel free to change.
Nice legitimate way to watch Top Gear mkii / The Grand Tour
Roughly $4.20 NZD a month to start with.