P3 Kill-A-Watt P4400 Electricity Usage Monitor for $19.99 Shipped

P3 Kill-A-Watt P4400 Electricity Usage Monitor for $19.99 shipped.  Here is a screenshot for your reference.  Kill-A-Watt is a tool that helps identify power-hungry devices by measuring their actual usage.  Note that it comes in OEM packaging, which means no pretty retail box but is otherwise identical.  Here is a review and a video clip about what this device can do.