Kill A Watt
Measure the Watts Find out which appliances are truly sucking energy and money right out of your pocket. Simply plug your appliance into the Kill A Watt and a large LCD display counts consumption by the Kilowatt-hour just like your utility company. Figure Electrical Expenses You can figure out your electrical expenses by the hour, day, week, month, even an entire year. Monitor Quality of Your Power Monitor the quality of your power by displaying Voltage, Line Frequency, and Power Factor.
Price: $37.50
This deal is even better now! The price has been lowered to $29.99: Kill-a-Watt Electricity Usage Monitor (looks like a slightly different model than the initial link).
