If you have a Wii U Deluxe system, don't miss this promotion from Nintendo that gives you bonus credit for your purchases. Their Deluxe Digital Promotion gives you points for your purchases that can be exchanged for Nintendo eShop credit.
All of your digitally purchased Wii U games, from either the eShop or through retailer's codes, earn you points. You get about 10 percent of the price paid. so your typical $60 will get you 599 points. You'll then cash those points in for credit, which would be $5 to spend at the eShop in this case.
The best part is that this is good from now (the page just launched) through December 2014. Free bonus money for games!
Wii and 3DS shop purchases are not eligible, and you folks with the white systems have to sit this one out.
If you've made a digital Wii U purchase, go get your free eShop money.