P3 Kill-A-Watt P4400 Electricity Usage Monitor for $17.99 Shipped

P3 Kill-A-Watt P4400 Electricity Usage Monitor for $17.99 shipped after code EL10POFF.  Here is a screenshot for your reference.  This tool 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.