buy Wii U game codes - who sells 'em?

my dear fellow forumites,

i'm curious if anyone knows of a website where you can buy codes for wii u games that can be redeemed on the eshop?

like what greenmangaming does for pc, but for nintendo games. ideally, i'd like to pay in US dollars.

@CrownKingArthur:

You can buy game digitally off of nintendos official site.

Few of them are sold on eBay