I am planning on flying next year from California (not exactly sure where, probably L.A.) to New Zealand. I am planning on getting a one-way ticket. I have two questions:

1) will I have a problem passing through customs in New Zealand with a one-way ticket (I will have a British passport).

2) Does anyone have an idea approx. how much that ticket would cost? I am planning on November departure.

Any help would be great, thanks a lot!