Yugster offers this Wireless LED Spotlight with Motion Sensor in Black or White for $9.97. Coupon code "FreeYugBuck" cuts it to $8.97. With $3 for shipping, that's the lowest total price we could find by $6. It features a 140-lumens output, motion sensor with 30-foot range, 30-second auto shut-off, and weatherproof design with UV-resistant housing. It requires four AA batteries, not included.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.