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Deus Ex: Human Revolution is on sale for 75% off as the Steam daily deal for 5/18/13.
Deus Ex: Human Revolution = $5 / £3.74 / €4.74
Deus Ex: Human Revolution – Augmented Edition = $7.49 / £5.74 / €7
Deus Ex: Human Revolution – The Missing Link = $1.74 / £1.24 / €1.74
Deus Ex: Human Revolution – Explosive Mission Pack = $0.49 / £0.24 / €0.49
Deus Ex: Human Revolution – Tactical Enhancement Pack = $0.49 / £0.24 / €0.37