Seeing stories like this, add in the Wii Fit promotions and Toys R Us, I have to wonder if some Wii sales might be unaccounted for in NPD results.
http://www.mlive.com/business/index.ssf/2008/05/everythings_bigger_at_new_walm.html
'Everything's bigger' at new Wal-Mart Supercenter
by Dave Muller | The Grand Rapids Press
Monday May 05, 2008, 10:11 PM
The electronics department stocked up on 60 Nintendo Wii game consoles for today's debut.
"Every grand opening I've been at, there's a big line for Wii's" Infante (Walmart spokesperson) said.