Thought people might find this info useful.

If you want a local SIM card while you're in NZ, you can get a 2degrees SIM for $5 (comes with $1 credit).
This is much cheaper than from Vodafone (I think they charge $30)

You can buy them at petrol stations, supermarkets etc

Their calling and txting rates are generally lower than other companies without buying a package

22c/min calling to 22 overseas countries (if have topped up in last 30 days) and 9c txting
.

No affiliation to the company. All prices are NZD

One disadvantage of 2degrees is you're not able to receive Twitter updates but with Vodafone and Telecom can receive these free.