Amazon takes an extra 20% to 25% off a selection of Leviton occupancy sensor light switches. (Prices are as marked.) Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping starts around $7.) Deal ends December 21. A couple of best bets, with prices after discount:

• Leviton 300W Incandescent / 150W LED/CFL Occupancy Sensor for $14.01 (pictured, low by $6)
• Leviton 600W Incandescent / 150W LED/CFL Occupancy Sensor for $17.75 (low by $6)