Just spotted this link over at /. on scamming Walmarts Price Matching Promo:
People are reportedly creating fake Amazon pages to show fake prices on electronics and other items. In the most heavily publicized cases, Walmart was reportedly duped into selling $400 PlayStation 4 consoles for under $100. From the article: "The company announced on Nov. 13 that it would price-match select online retailers, including Amazon.com. However, any Amazon member with a registered selling account can create authentic looking pages and list items 'for sale' online. Consumers need only take a screen capture of the page and show it to a cashier at checkout in order to request the price match."
Thought it was an interesting read, like one pundit commented "This is why we can't have nice things."
Seems more like a case of retail control failure. You wouldn't be able to do that here because price-matches require manager approval. Why Walmart has an employee on the spot approval system, I don't know, perhaps as a gesture of goodwill. But is is as you say "This is why we can't have nice things.".