Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Kusatsu (55% of total searches to Gunma Prefecture). The next most popular destinations are Takasaki (17%) and Nakanojo (14%). Searches for hotels in Tsumagoi (14%) are also popular.
KAYAK users have found double rooms in Gunma Prefecture for as cheap as $92 (Shibukawa) in the last 3 days. The average price is $111.