Monoprice offers two Monoprice Z-Wave Plus Wall Socket Smart Plugs for $39.98. Coupon code "ZWV" cuts that to $34.98. (It doesn't apply for just one plug.) With free shipping, that's the lowest price we could find for this quantity by $15 and the best per-unit price we've seen. It allows you to control AC power manually, via Z-Wave devices, or via programming.