It seems like Playstation VR (previously known as Project Morpheus) might be a fairly expensive peripheral according to Bloomberg. They have spoken to the Sony CEO Andrew House, who says it will cost as much as a new console.
He didn't go into detail, but PlayStation 4 is priced around $399, which might give an indication of how much it will be. Playstation VR will be launched with ten games, sometime early next year.
Thanks, MCV