MidnightBox offers the Cree XMLT6 1800-Lumen Tactic Flashlight Torch for $9.95 plus $3.99 for shipping. That's the lowest total price we could find by $2. It's shakeproof, waterproof, and features high, medium, low, strobe, and SOS modes. Deal ends December 19.
Note: It's not guaranteed for delivery by Christmas.