if anyone is planning to attend to Namie's concert on the extra dates (22nd and 23rd of december) the general sales just opened!
The sales are here:
http://portal.tickebo.jp/sp/1411-amuro_kdt/
This is the only place you can get the tickets, don't expect to find her tickets on resale stores, because Ticket Board uses digital QR code ticket through the cellphone, so resales are really hard.
You can pay for the tickets using an international credit card, so don't worry
It's first come first served basis, so run before they are sold out!
Just bought my ticket for the 23rd, I'm so relived I'll be able to watch Namie live while I'm still in Japan
