Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Franz Josef Glacier (46% of total searches to West Coast). The next most popular destinations are Hokitika (20%) and Greymouth (19%). Searches for hotels in Fox Glacier (15%) are also popular.
KAYAK users have found double rooms in West Coast for as cheap as $79 (Greymouth) in the last 3 days. The average price is $165.