You can probably get it for less than $10. I think places like Frys were selling it for that low.
but it is not worth the purchase. I only got one because I won it in a CAGcast contest. The thing isn't stable when you use the stick, the d-pad isn't much of an improvement over the 360 controller, and the whole button placement is whack. Someone posted a YouTube video review of it and he had to glue it onto a piece of wood just so it would be somewhat-useful.