Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Sapporo (53% of total searches to Hokkaido Prefecture). The next most popular destinations are Niseko (33%) and Kutchan (8%). Searches for hotels in Furano (6%) are also popular.
KAYAK users have found double rooms in Hokkaido Prefecture for as cheap as $47 (Asahikawa) in the last 3 days. The average price is $295.