NZT is the only NYSE listed stock and they have a lot of issues (I used to own it and sold a couple of years ago). There are stocks galore on the NZ exchange (go to NZX.com to research) that can be traded in the US (go to pinksheets.com to look up the five letter designator you will need for US trading) through most brokerage firms.

There are no NZ ETFs. There is one open end mutual fund in the US with decent NZ exposure, ticker is CNZLX.

Hope that helps