Best price for inter New Zealand flights?

Hello. I will have to go to New Zealand on a business trip. But I will have to go to several places there. So I must be informed about prices for my travel there. Can someone tell me Best price for inter New Zealand flights? I am very grateful for every information that you will give me. Thank you in advance.

I am not very informed about this flights inter New Zealand. But I will have to go to the similar trip. I dont have exact information about prices. But as much as I know the prices are not much higher than in other countries. I was In NZ once. And I must say that I love that country. I am only sorry because this time when I go there, I will not have enough free time. NZ has wonderful nature. And I like to walk and enjoy nature there. But you will see that for yourself. If you find out some exact information about prices for flights please share with me.