P3 International P4400 Kill A Watt Electricity Usage Monitor for $17.49 Shipped

P3 P4400 Kill A Watt Electricity Usage Monitor for $17.49 shipped.  Here is a screenshot for your reference.  Kill-A-Watt helps identify power-hungry devices by measuring their actual usage.  Here is a review and a video clip about what this device can do.  Alternatively, it is currently available at Amazon for $19.99 with free shipping on orders over $25.