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Port Royale 3 and it’s DLC are on sale for 75% off as the Steam daily deal for 3/19/13.
Port Royale 3 = $9.99 / £8.74 / €9.99
Port Royale 3 Four Pack = $29.99 / £26.24 / €33.74
Port Royale 3: New Adventures DLC = $1.49 / £1.12 / €1.24
Port Royale 3: Dawn of Pirates DLC = $1.49 / £1.12 / €1.24
Port Royale 3: Harbour Master DLC = $1.49 / £1.12 / €1.24