If you downloaded the Sims 3 base game from steam and you want to buy an expansion pack do you have to buy it from steam or can you get it from a store like Wal-Mart

You can buy an expansion pack from a store like Wal-Mart for a Sims 3 base game bought through Steam instead of needing to buy it through Steam. Simply go to the Origin website and register your products through there and you will receive a Steam key for your game.