Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Rapid City (40% of total searches to South Dakota). The next most popular destinations are Deadwood (27%) and Sioux Falls (20%). Searches for hotels in Murdo (14%) are also popular.
KAYAK users have found double rooms in South Dakota for as cheap as £30 (Deadwood) in the last 3 days. The average price is £173.