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The Hearts of Iron 3 Collection is on sale for 75% off as the Steam daily deal for 3/21/13.
Hearts of Iron 3 Collection = $6.24 / £5.49 / €6.24 – includes below:
Hearts of Iron 3 = $2.49 / £1.99 / €2.49
Hearts of Iron 3 DLC on sale for up to 75% off.