Tickets are only 7800 yen a piece, I imagined them to be more expensive, especially for a one time special event like that. Then again I have no idea what the usual prices are for concerttickets in Japan

oh well
So if you want to go you should definitely get tickets now they are still available (was available for me a few hours ago even when people said it was sold out)... youll have months to save up for a trip to Okinawa