Nintendo finally joins Amazon's digital video games store, making it possible to purchase WiiU, 3DS and Wii content.
Link: http://www.amazon.com/Nintendo-digital-downloads/b/?node=12597678011
WiiU: http://www.amazon.com/wiiu-downloads/b?node=10111112011
3DS: http://www.amazon.com/3ds-downloads/b?node=12591944011
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You can obviously buy these from the eShop directly, but for example South American owners can now purchase content from Amazon with their non-US cards.