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RadioShack offers the P3 International Kill-a-Watt EZ Electricity Usage Monitor, model no. P4460, for an in-cart price of $19.99. Opt for free ship-to-store pickup to dodge a $6.99 shipping charge. That's $3 under the lowest total shipped price we could find elsewhere; most stores charge over $30 with shipping included. Sales tax is added where applicable. It calculates electricity costs and gives you weekly, monthly, or yearly forecasts.