Here are some of the official Samsung Galaxy S8 accessories and their price tags - GSMArena.com news
Amazon.com: Aeska Galaxy S8 Active Case, Ultra [Slim Thin] Flexible TPU Gel Rubber Soft Skin Silicone Protective Case Cover for Samsung Galaxy S8 Active (Black) : Cell Phones & Accessories
Amazon.com: YMCCOOL Galaxy S8 Plus Waterproof Case, Full Protective Shock/Snow/Dirtproof with IP68 Certified Waterproof Case for Samsung Galaxy S8+ Plus 6.2inch : Cell Phones & Accessories