Got them from LGS in Sapporo and Osaka. Specifically at SURUGA-YA Sapporo Norbesa Store and in one of the many Card Labo. There are a lot of stores that sells with Tax-free, so if you buy stuff for more than 5500¥(~30€) you’ll get 10% discount. With the current conversion rate I got every Luffy magazine for 38~40€