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There’s a Paradox Publisher Weekend Sale going on at Steam. Runs from 6/20 – 6/24. There’s a standard discount of 25-50% on Paradox titles. There will also be daily deals during the sale.
The daily deal for 6/20/13 is 66-75% off the Cities in Motion Series:
Cities in Motion 2 = $6.79 / £5.09 / €6.79
Cities in Motion Collection = $12.49 / £11.24 / €12.49