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December 2013 NPD: Wii U sells roughly 480,000 units (rumor)
After the NPD Group revealed that December was the Wii U’s best month in the US from a sales perspective, we knew the console moved at least 460,000 units. Apparently, based on the latest leaks, the final figure sits at around 480,000. We can’t confirm this figure currently, though it seems quite likely. Source
Brian