LightInTheBox offers this Cree XM-L T6 LED Front Bike Light for $5.99. Coupon code "BIKE5345026" cuts that to $4.99. With free shipping, that's tied with our November mention, $11 off, and the lowest total price we've seen. It features a 500-lumen output and waterproof body. It requires an external power source and connects via USB. Deal ends February 15.
Note: Uncheck "Add Shipping Insurance to your order" during checkout to remove the 49-cent fee.