iCoostor via Amazon offers the iCoostor WiFi Smart Plug 2-Pack in White for $31.99. Coupon code "WK6BU2IK" cuts the price to $20.99. With free shipping, that's $11 off and the lowest price we could find. It's compatible with most smart devices. Deal ends March 20.

Update: The price has dropped to $29.99 before coupon, $19.69 after.