Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Wernigerode (63% of total searches to Harz). The next most popular destinations are Quedlinburg (13%) and Goslar (13%). Searches for hotels in Bad Lauterberg (13%) are also popular.
KAYAK users have found double rooms in Harz for as cheap as $69 (Altenau (Niedersachsen)) in the last 3 days. The average price is $231.