In recent news, Nintendo sold the Wii U GameCube adapter recently on it's site, making good on the fact that they said it would come back into stock -- sorta. It sold out in roughly 30 minutes, so I hope you were staring at the internet at that exact time. Don't you hate it when that happens?
Apparently though there's a third-party option available on Play-Asia. It's $20, with reasonable shipping costs not included. The actual unit has no reviews, so buyer beware -- it could crap out after a few tries or in the near future. Still, it's something, and it also has a Wii U or PC switch as well as support for emulators.
GameCube controller adapter for Wii U and PC [Play-Asia] Thanks Stephen!
via destructoid http://ift.tt/1DtdXvy