You could also try La Leche League - they have
local groups that meet for informal classes / support meetings. They are run by a trained BF educator. I contacted my local educator in Lower Hutt & she was really welcoming of expectant mums. Not sure what they are like, I am going to one in a couple of weeks. They might be less structured than a formal class, but also a great opportunity to meet other BF mums, get tips etc.