How much will it cost, roughly, to study abroad from the US to New Zealand in the AFS program?

[unco]

I am interested in studying abroad for a year in New Zealand--I'm from Indiana. I am wondering how much it will cost in order to do this. I have not yet brought it up to my parents/family yet, so I want to be prepared to tell them if they ask. It's something I really want to do, considering it's my favorite country and I've been there before--it's amazing. I would love to make personal contact with a friend that lives there as well.
Does anyone know how much it would cost?
Does anyone know if you can choose the city you want to live in (as a guest with a host family)?