Amazon offers Prime members the Belkin WeMo WiFi-Enabled Light Switch, model no. F7C030FC, for $30.99 with free shipping. (Best Buy charges a few cents more via pickup; while Home Depot charges the same price with free shipping.) That's $7 under our February mention and the best price we've seen. (It's a current low by $11.) The WeMo allows you to control your lights from anywhere with a wireless or mobile Internet connection via smartphone or tablet.
Of note, Amazon also offers the Belkin Wi-Fi Power Outlet Adapter, model no. F7C029FC, for $39.49 with free shipping. (Best Buy charges the same price.) That's $5 under our mention from last winter and the lowest total price we've seen. (It's also a current price low by $16.) This wireless adapter can be controlled using the free WeMO app on smartphones and tablets running at least Android 4.0 or iOS 6.0. Both deals end today.