Turquoise Premium can be purchased from the official retail site: the PPMB SHOP but also from the Amazon Japan site if you live in Japan, Australia, USA, Canada, Mexico, UK, Germany, France, Spain, Italy, Netherlands, Sweden or Poland. The book can also be purchased from the Amazon Japan website.
 
From 2023, it will also be available at duty-free shops at Tokyo Haneda Airport.
In addition, it is also available in Singapore and Vietnam.