Check out Voldemort's Illuminating wand, great accessory if your planning on becoming Voldemort for a costume party.
Harry Potter: Voldemort Illuminating Wand - Explore your evil side with the Voldemort Illuminating Wand! Wave the wand and the light goes on. Wave it again, and it turns off! Wand measures 14-inches in length. Requires two AAA batteries, not included.