if you don't care for quality, go for the GV-USB2 and let your wiiu output to a/v cables.
if you do care about quality, go for an elgato or AVerMedia **internal** card and let your wiiu output via hdmi.

GV-USB2 comes at ~40$
elgato & AVerMedia cards are spread all over the price tables.

Need help setting up your stream, or recording your runs? This is the place to ask.

Streaming / Recording / Equipment

Looking for cheap capture card to record my Wii U