Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Manaus (73% of total searches to Amazon Rainforest). The next most popular destinations are Leticia (14%) and Rio Branco (9%). Searches for hotels in Itacoatiara (5%) are also popular.
KAYAK users have found double rooms in Amazon Rainforest for as cheap as $10 (Manaus) in the last 3 days. The average price is $116.