I think orion not yet available, according to some admin on this forum it could be any day now. I believe the Orion are for casual use like music and videos while the vulcan is made for gaming. Orion probably will be available online like amazon and newegg. Asus's estore might have it too when it comes out. Vulcan is already available, but i don't think vulcan pro is planned to be released on North America.
Correction: looks like Vulcan pro will be released in Jan according to some admins.