Although it may be perfectly legal to fly with these chemicals, the sad reality is that doing so is a gamble and when you consider the possible consequences, really not worth the risk. I think this is especially true with raw chemicals. You may be able to get away with a bag of Kodak Xtol or similar, but as people mentioned earlier, raw chemicals in a plain white plastic bottle is just asking for trouble.
I will have everything shipped via FexEd. There are some camera stores in NZ, but the prices are very high. A bag of fixer was listed at $30. I doubt that it would be easy to find raw chemicals in NZ, as I had difficulty locating those in a large city as Berlin.