They don't price guarantee on special sales like Black Friday: http://www.amazon.com/gp/help/customer/display.html?nodeId=200726210 Item 6 under Terms and Conditions: Time-limited sales events (such as Black Friday, "early bird" or "door buster" offers ), offers advertised as limited in time or quantity, clearance, liquidation and going-out-of business sales, and loyalty program offers are also ineligible for the Guarantee.