Japanese Pokemon is a different buy from English. Packs are smaller, five cards instead of ten, the price per pack is lower, and sets follow the Japanese release calendar, so a set often sits on the shelf in Japanese months before an English version exists. Japanese stock in Thailand moves set by set rather than being reordered on demand, so the listings here change as sets sell out. Everything is bought on the verified second-hand market in Thailand, authenticated in-house and tied to a numbered Purchase Agreement you can check yourself.