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Meritline offers the P3 Kill A Watt Electricity Load Meter and Monitor, model no. P4400, for $20.99. Coupon code "MLCKB06YNL1" drops it to $14.99. With free shipping, that's a buck under our December mention and the lowest total price we could find by $3. This usage monitor connects to appliances to calculate their electricity expenses by the day, week, month, or year. Deal ends after 100 coupon uses.