My small family of two has contributed to 3 maybe 4 of those sales. I can't even remember anymore...
...more than 6 million DS were sold in the U.S. in 2007 through Nov. 30. Taken another way, that's about one every five seconds... and remember it doesn't include December.
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I think by this point it's easier to ask who doesn't own a Nintendo DS
Me! And I don't want one, either.