A municipal tourism information booth (tel. 065/260-251) is at the arrivals terminal baggage claim at the airport. It maintains a chart of hotels and costs, and the staff is happy to dispense information (and frequently opinions) about the various jungle-tour and lodge operators.
One of Peru's most helpful tourism information offices is on the north side of the Plaza de Armas at Napo 232 (tel. 065/236-144). The English-speaking staff has free maps and lists of all recommended hotels and tour operators (including photo albums of lodges), and will try to sort through the (often intentionally) confusing sales pitches of jungle-tour companies. The office is open Monday through Saturday from 8am to 8pm, as well as occasional Sunday mornings.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.