You can buy from the very cheap to the very expensive. The question is, do they do what they are intended to do. I got a very cheap spring loaded forward grip bi pod given to me and the thing works. When deployed it provides a raised rest for the rifle. 12 bucks on line. Or a very expensive Harris? Does the same thing, maybe with more bells and whistles and probably better than mine, but it does what it was intended to do. So does my cheapie. It all depends on budget and choice.