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I've been using CD Key House for the last year or two without any issue. I always check there first before I buy my games. Have had no issues so far. EA games alone, I've bought FIFA 11, FIFA 12, BC2, and BF3 from them with no issue. All games show up in Origin and launch fine.
I got mine from here http://cdkeysdiscount.com/117-cd-key-battlefield-3.html for $35 although the price has gone up to $40.
ME3 comes with bf3 if you are down with that. decent deal for 2 games.