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.