I recently found a 2008 Arizona quarter that I think is classified as a rotated die error. When the "Heads Up" side of the quarter is facing you, the image(cactus, etc..) on the other side is completely upside down. From what I have read this is called a 180 degree rotated die error. Has anyone seen this anywhere or with this particular coin. If so, is it worth anything? I have not been able to find anything about this error. Thanks in advance.