US Amazon users can now purchase Wii U and Nintendo 3DS titles digitally through a download space on Amazon.com. There are a host of titles to choose from, including some of Nintendo’s heavy hitters such as Super Smash Bros., Splatoon, Pokemon X & Y and many more.
Once you make your selection click on the Nintendo Network link on the “thank you page” and from there the content code is redeemed and the game is sent directly to your Wii U or 3DS.
Pricing seems to be the same as Nintendo’s eShop but Amazon is also known to host sales and deals from time to time. You can browse the library here.