Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Bahía Inglesa (45% of total searches to Atacama). The next most popular destinations are Copiapó (39%) and Caldera (12%). Searches for hotels in Vallenar (4%) are also popular.
KAYAK users have found double rooms in Atacama for as cheap as $31 (Copiapó) in the last 3 days. The average price is $64.