Too lazy or forgetful to turn off your subwoofer when you shut down your stereo? Or maybe you take the time to do so, but wish a magic elf would power down your computer’s monitor and external hard drive for you instead? You’re in luck, local water & energy efficient device supplier EFI is offering smart power strips at approximately 40% off retail (with the included free shipping), in partnership with Mass Save. With these power strips you can save the energy these dormant devices would otherwise use since all of the peripherals plugged into white sockets will automatically be turned on or off when you do the same to the device plugged into the blue socket; avoid the reds, they’re always on. Ain’t science super? Offer ends May 30.

(Of course you’d still be better off using the power switch for the whole strip, but these are often located in inconvenient places, and some energy savings beats no energy savings.)