GameStop sells 320,000 Wii U units during the holiday period
http://nintendoeverything.com/109933/gamestop-sells-320000-wii-u-units-during-the-holiday-period/
Through a six week period, GameStop moved 320,000 Wii U units worldwide. In early December, Nintendo confirmed that it had sold 425,000 systems in the US during its first week of availability. Wii U sold nearly 558,000 units in Japan over a three week period. Nintendo has not shared data for its European territories.
http://nintendoeverything.com/109933/gamestop-sells-320000-wii-u-units-during-the-holiday-period/