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Another one of those Prince William and Kate Deals. At the EA Store if you use the promotional coupon code RoyallyWeddedSims at checkout you can get The Sims 3 for $19.99 or The Sims 3: High-End Loft Stuff expansion DLC for $9.99.
The Sims Medieval is also on sale for $24.99 with no promo code necessary although I think that’s the going rate for it currently.