Top Greener via Amazon offers Prime members the Top Greener PIR Motion Sensor Switch for $21.99. Coupon code "MKKMYIPA" cuts it to $17.59. With free shipping, that's $17 off and the lowest price we could find, although we saw it for $4 less a month ago. It works with multiple bulb types and features 1,200-square feet of coverage and 180-degree view. Deal ends September 22.