New Zealand Language Centres (NZLC) have a teacher training centre in Auckland that has been Cambridge approved. Courses are taught by qualified, experienced professional instructors.
CELTA Courses run full-time for 5 weeks, with several intakes throughout the year. Check out the school's CELTA course page for current course start dates and fees.
During the course students gain actual supervised teaching practice and feedback.
More information about NZLC courses can be found here: CELTA Course Auckland