Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Wernigerode (48% of total searches to Harz). The next most popular destinations are Goslar (20%) and Quedlinburg (19%). Searches for hotels in Benneckenstein (13%) are also popular.
KAYAK users have found double rooms in Harz for as cheap as $30 (Goslar) in the last 3 days. The average price is $182.