Plaza of Pride
Daenerys and Ser Jorah talk to Kraznys mo Nakloz about purchasing some Unsullied as an army in episode 3x01 “Valar Dohaeris”.
Source: Winter Is Coming
Walk of Punishment
Daenerys, Ser Jorah, and Barristan Selmy walk past they slaves strung up to die and Daenerys attempts to give one of them her water in episode 3x03 “Walk of Punishment”.
Palace of the Good Masters
Daenerys, Ser Jorah, and Barristan Selmy meet with the Good Masters and she agrees to sell one of her dragons for all of the Unsullied in episode 3x03 “Walk of Punishment”.