This is the list of hotels in Buenos Aires that have corporate fares with ICAS. You need to mention ICAS-UNSAM when you make your reservation.
Miguel made his reservation online at the KER Urquiza (the second on the list), and paid U$D 54 per day, and U$D 34 in taxes. He did it online and it was cheaper than when he asked via email for a quote. (They asked for U$D 60/day.)