Origin is currently offering Sims 3 owners a free copy of the Town Life Stuff pack in addition to hosting a Sims Anniversary sale. The only requirement for receiving the free stuff pack is to register your Sims 3 game through Origin. Complete details and registration form can be found on The Sims Anniversary Giveaway website.
The Sims Anniversary Sale on Origin has discounts of up to 50% off The Sims 3 and its various expansions and stuff packs. The complete list of discounted titles can be found on the Origin website.