Nationwide Surplus via eBay offers the Aeon Labs Aeotec Z-Wave Controlled Micro Appliance Switch
, model no. DSC26103-ZWUS, for $29.99
with free shipping
. That's the lowest total price we could find by $19. Use this with existing wall switches to enable Z-Wave wireless command and on/off control via a Z-Wave controller (not included). It can also report immediate wattage consumption or kWh energy usage over a period of time.