Accomondations are handled from a travel provider in Argentina called Surexpress. You may contact them in USA at 850-402-0276 or in Argentina directly at 54-11-4393-3655 and 4325-0252.
The Saint George is a cost alternative, being a 3 star hotel.
Located in the heart of Puerto Iguazu, only 15 minutes away from the Iguazu Falls and only 500 meters away from the International Airport on the (Argentine side).
There are restaurants, laundry, bar, swimming-pool, 24-hour room service, meeting room. Rates include a buffet breakfast.