Walmart is planning a Layaway purchase option for the Wii U deluxe and the Wii U Basic, so if your a american and want a Wii U Deluxe, this is probably your last chance before the ship sails.
The Pre-order Barcode and Layaway paper:
Wii U Preorder Walmart - Imgur
It's happening right now, you better go get one. They are open 24 Hours a day.