Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Auckland (66% of total searches to North Island). The next most popular destinations are Wellington (16%) and Rotorua (11%). Searches for hotels in Taupo (9%) are also popular.
KAYAK users have found double rooms in North Island for as cheap as S$ 35 (Mount Maunganui) in the last 3 days. The average price is S$ 156.