You can already buy a Samsung Galaxy S6 case on Amazon
Softbank Galaxy S6 Edge 404sc go-rudopuratinamu White GB ROM : Electronics - Amazon.co.jp
Amazon.co.jp: Docomo Galaxy S6 sc-05g For LCD Protective Film Anti-reflective (Mat) Type ☆ : Electronics
Amazon.co.jp: Brains Android One S6 Hard Smartphone Case Cover Hakudou Hakudou. hakudou Japanese Style Modern Art Illustration Designers Android One S Six Smartphone Case Smartphone Case Smartphone Case Android Case Cover :
Amazon.co.jp: Akisei Android one s6 Smartphone Case Smartphone Cover Shock Absorption Anti-Scratch TPU Silicone Thin Qi Charging Compatibility Lightweight, Soft, Clear, Clear, Yellow, Anti-Slip Y! Mobile Kyocera : Electronics
Amazon | Samsung Galaxy S6 Edge+ G928A 32GB Unlocked GSM Quad-Core 4G LTE Smartphone w/ 16MP Camera - Black Sapphire by Samsung | サムスン(SAMSUNG) | 携帯電話・スマートフォン本体
Amazon.co.jp: AnglersLife KYV48 Notebook Type Android Smartphone Case with Magnet Card Storage Evergreen Wild Hunch 8 Footer Cool Android One S6/GRATINA [KYV48] : Electronics
Amazon.co.jp: Smartphone Smartphone Notebook Smartphone Smartphone Case Cat Face Series [057_Cat Face (Clobuchi)|Android One S6] : Electronics
Amazon.co.jp: Android one S6 S6-KC case notebook type cover notebook type case AndroidOneS6 AndroidOneS6 case S6KC S6-KC case S6KC case notebook case smartphone case paisley embroidery olive : Electronics
Amazon.co.jp: Ruuu Android One S6 Hard Smartphone Smartphone Case Cover, Illustration, Monotone, Hedgehog B, White, Line Drawing, Animal Crossing, Needle, Airplane, Character, Unique, Flowers, Forest, Heartworn, Simple, Cute, Pretty, Stylish, Funny ...