This is cheaper option...
http://www.homedepot.com/p/Rayovac-W...A-BC/206767090
That said, I have used this for tac-flashlight training and they have held up to the abuse and impact that we put them through. The rubber ends absorb impact so it's a bit safer if you get hit with it but it also does a good job of protecting it if and when it gets dropped. Super bright with two brightness modes, tough aluminum body, and cheap. A no brainer to me for keeping in the car.
William