Even WalMart screws up their site.
Wal-Mart Stores Inc.’s website was selling kayaks for about $11 and computer monitors for about $9 earlier today owing to a technical error that led the world’s largest retailer to shut down its online store for maintenance.
The pricing abnormalities were caused internally, said Ravi Jariwala, a Wal-Mart spokesman.
more:
http://www.bloomberg.com/news/2013-11-06/wal-mart-online-price-error-leads-to-temporary-shutdown.html

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