From Amazon's pricing page:

"Where an item is offered for sale by one of our merchants, the List Price may be provided by the merchant."

http://www.amazon.com/gp/help/customer/display.html/ref=hp_468502_list?nodeId=468502#list

If products sold by amazon are priced wrong like this I'm guessing it's a mistake or they borrowed the List Price from a merchant that listed it incorrectly.