Aptoyu via Amazon offers its Aptoyu 10-LED Waterproof Wireless Motion-Sensor Solar Light 4-Pack for $20.99. Coupon code "KW29W5NU" cuts that to $15.98. With free shipping via Prime, that's a buck under our December mention, $14 off, and the lowest price we could find. (At $4 per light, it's also the best per-unit price we've seen.) Features include ABS construction, a sensing range of 10- to 16.5-feet (with a 120-degree angle), and IP64-rated waterproofing. Deal ends March 31.