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The Sims 3 is on sale at Direct2Drive (D2D) today as their Mac Monday Deal for $19.98. Same price for the PC version. Use a 15% off promotion code such as F7530AEE8D991B19332624D10F9C734F to make it $16.98. (If the coupon has expired you can get a new one by clicking here.)
If you’re in the UK it’s £12.73 at Direct2Drive UK after a 15% off coupon. The promo code for D2D UK is royalflush.
The Sims 3 Deluxe version is also on sale at Amazon for a Mother’s day promotion as PC Digital Game Downloads. The Deluxe version comes with The Sims 3 and The Ambitions Expansion DLC. I think the other DLCs are also on sale at Amazon currently.