Newegg offers the P3 International Kill-a-Watt EZ Electricity Usage Monitor, model no. P4460, for $26.99. Coupon code "EMCPFHF99" cuts it to $20.24. With $1.99 for shipping, that's the lowest total price we could find by $4, although we saw it for $2 less in February. It calculates electricity costs and gives you weekly, monthly, or yearly forecasts. Deal ends April 30.