https://www.amazon.com/dp/B002P6EQPW/
Amazon has the Mr. Beams Wireless Long Range Motion-Sensing LED Weatherproof Spotlight w/ Wire Free Easy Mount Kit (Dark Brown, MB360) for $8.30 with free shipping
Extremely bright LED with minimum power consumption, 140 Lumens. MB363 is three (3) individual units of the Mr Beams MB360 Spotlight
Motion sensor turns Spotlight on and off automatically
Features weatherproof design for durability
Simple wireless installation in minutes
Provides 350-Square Feet of coverage, battery operated