Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Puerto Iguazú (59% of total searches to Parana River). The next most popular destinations are Foz do Iguaçu (33%) and Corrientes (5%). Searches for hotels in Santa Fe (3%) are also popular.
KAYAK users have found double rooms in Parana River for as cheap as $17 (Foz do Iguaçu) in the last 3 days. The average price is $91.