Well I got a mate in America to buy me an iPhone and ship it down here. Now the things is, will we get the $100 apple credit to use down here (obviously converted into AU Currency). Or do we have to purchase stuff on the US website and get it shipped down?

Anyone have any ideas?

You definitely won't get any local credit to use. Apple currently frowns upon people using iPhones in other countries than the USA so they won't do you any favours in that regard.

You will get a credit on your account for the store which you purchased the phone at - for me it's the online Apple Store and yes I'll have to get it shipped to a friend in the USA then sent to me in New Zealand.