Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Morioka (76% of total searches to Iwate Prefecture). The next most popular destinations are Hiraizumi (8%) and Miyako (8%). Searches for hotels in Hachimantai (8%) are also popular.
KAYAK users have found double rooms in Iwate Prefecture for as cheap as $64 (Hiraizumi) in the last 3 days. The average price is $255.