I have three extra codes from the Play Nintendo event last year. From what I can tell they'll work on any North American system, they may work on others but I don't know for sure. They expire at the end of the day so hopefully some of you can use them. Please post if you take a code.
B0NX38YP2W8H5SFL
B0NX38YM2C5YGWBD
B0NX38YN46B4H4MS
B0NX38YP2W8H5SFL
B0NX38YM2C5YGWBD
B0NX38YN46B4H4MS