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Re:Journalist goes undercover at Walmart by wheels on Thursday April 09, 2009 @11:17PM (#555637)
This was already posted here 2 months ago:

http://news.ycombinator.com/item?id=462531

Re:Journalist goes undercover at Walmart by bumbledraven on Thursday April 09, 2009 @11:24PM (#555640)
That's just a brief bit by the same author at boingboing - the nypost article linked here is much more detailed.