G-Shock Mini watches are available in Japan (GMN-500, GMN-550

Bike shop and apparel retailer Chari & Co Japan has a whole suite of G-Shock Mini watches in stock (use Zozotown link below for international shipping).

Black Casio World Time Watch with Color Screen Mod (Pick your colors) – rswatchworks

Overvloed Arena Proficiat casio g shock mini Lui ga sightseeing Impasse

WTS] Vintage Casio MQA-725 Ana-Digi Alarm Mod. 333 Japan Made Men's Quartz Watch - $250 USD Only : r/Watchexchange

Casio –

G-Shock Watches for Kids: 10 Timepieces for Little Wrists

WTS] Vintage Casio MQA-725 Ana-Digi Alarm Mod. 333 Japan Made Men's Quartz Watch - $250 USD Only : r/Watchexchange

Chari & Co x G-Shock GA500K-3A Collaboration Watch - G-Central G-Shock Fan Site

CASIO G-SHOCK MINI Watch GMN-550-1BJR genuine Sport stopwatch 4971850886334

G-Shock but Mini sized Modern Engine in a Classic Body Frame