that ost is bundled together with the bluray
http://www.cdjapan.co.jp/product/ZMXZ-11872 which i finally figured out lol as i couldn't find it separate and it is not cheap at all. unless/until they release it as separate it may be a long wait and if it has been purchased from overseas and someone is planning to upload it, it will take at least another week or 2 depending on shipping speed if they bought it on release day so id say give it another month or 2. :) as i only purchase the soundtracks i am going to have to wait for its release.