Some pretty good deals for anyone who can get time off work. Most of the offers are ex Australia so you would want to combine with some cheap AirAsia/Jetstar/Grabaseat flights. Its worth mentioning that cruises are usually all-inclusive food wise which can be a huge saving vs a traditional holiday.
NZ Example:
Departs 30 Jan 2017/4 nights/Sydney to Akl/Twin share $223 ea ($167 ea if with a child)
All recreation is free ?