Oh, I guess the GameStop site had it wrong. The offical Nintendo site says it lasted until Sept. 17. http://www.nintendo.com/whatsnew/detail/V0g236v54OwPF1QlWzDG5kVtE5Cb7oHo
Yes, the 17th was when the promotion ended. NOT when the code itself expires. As I've stated multiple times, there is no posted "Expiration date" on the card.