http://walletup.com/i/postimg/20100729_145836p.jpg

P3 Kill-A-Watt P4460 Electricity Usage Monitor with Cost Caculation for $28.97 Shipped

P3 Kill-A-Watt P4460 Electricity Usage Monitor for $28.97 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.  This is a newer version that includes cost calculation in addition to power usage and other related measurements.  We have a couple of them and have found them to be very useful.  Here is a review for your reference.