I went to Target this morning to exchange the COD: Ghosts I got on Sunday for BF. I had the chick return all of the games I got on Sunday and re-ring Knack, Killzone and AC4. I also gave her the coupon. She rang everything through scanned the coupon, and I was waiting for her to call a manager over for an override, but instead she gave me my total.
Looks like the coupon stacks all on its own now, but it gives 30% off of two games making them $42 each, and then rings up another game at $60. With this, one of the $42 Games becomes free leaving a total of 3 games for ~$102. Not as good as getting an override for $84, but still a great deal overall.