Cityhop Carsharing Service – Free Signup, 1st Year Membership + First Driving Hour Free (Save up to $54) Auckland & Wellington
Cityhop cars by the Hour - Auckland & Wellington
Free signup to Cityhop's "Hop Starter" yearly membership, and the first driving hour free (save up to $54)
Hop Starter - 1 registered driver / $29 per year
Not sure if works in other cities, have only tried Auckland so far.
You'll need to enter this under Promotion Code when you apply.
Offer expires midnight 1st April 2019.