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Steam has the The Sims 3 on sale for 60% off as the daily deal for 3/1/14.
The Sims 3 $8
The Sims 3 Plus Showtime $12
The Sims 3 Plus Pets $16
The Sims 3 Plus University Life $16
The Sims 3 DLC $8 – $16 each.