Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Baden-Baden (25% of total searches to Black Forest). The next most popular destinations are Breitnau (25%) and Freiburg im Breisgau (25%). Searches for hotels in Schluchsee (25%) are also popular.
KAYAK users have found double rooms in Black Forest for as cheap as $121 (Freiburg im Breisgau) in the last 3 days. The average price is $313.