SystemUser
Member
Yes there is. You can buy a download code off the Nintendo eShop website. You just need to buy it as a guest, without linking your NNID. Here's the link if you are located in the U.S.: http://www.nintendo.com/games/detail/pvqEpTCeo0N6UW0Da3T1f1c2vzWP7iCd
Then you can just redeem the download code when you have the capacity for it.
Do you know how long the codes last for? I don't own a Wii U, but I will get one eventually. I assume the codes last for a few years at least. I just used the Club Nintendo code from my 2006 copy of New Super Mario Bros for the DS.