Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Rapid City (59% of total searches to Black Hills). The next most popular destinations are Sturgis (18%) and Box Elder (12%). Searches for hotels in Keystone (12%) are also popular.
KAYAK users have found double rooms in Black Hills for as cheap as $88 (Keystone) in the last 3 days. The average price is $378.