You can already buy a Samsung Galaxy S6 case on Amazon
Amazon.com: Galaxy J7 Case,J700 Case with Flowers, Ueokeird Slim Shockproof Clear Floral Pattern Soft Flexible TPU Back Cove for Samsung Galaxy J7 J700 (2015) (Rose Flower) : Cell Phones & Accessories
Amazon.com: Fintie Folio Case for Samsung Galaxy Tab A 8.0 (Previous Model 2015), Slim Fit Premium Vegan Leather Cover Compatible Galaxy Tab A 8.0 SM-T350/P350 2015 (NOT Fit 2017/2018 Version), Black : Electronics
Amazon.com: Samsung Galaxy S6, White Pearl 64GB (Sprint) : Cell Phones & Accessories
Sprint offering Samsung phone buyers a free year of Amazon Prime
Amazon.com: Jeylly Galaxy J7 Case, [Shock Proof] [Black] Dual Layer Defender Protective Scratch Absorbing Hybrid Rubber Plastic Impact Defender Rugged Hard Case Cover Shield for Samsung Galaxy J7 Released 2015 : Cell
Amazon.com: BMOUO Kids Case for Samsung Galaxy Tab E 9.6 - Shockproof Light Weight Protection Convertible Handle Stand Kids Case for Samsung Galaxy Tab E / Tab E Nook 9.6 Inch 2015 Tablet , Rose : Electronics
Amazon.com: Cadorabo Book Case Compatible with Samsung Galaxy A3 2015 in Sky Blue - with Magnetic Closure, Stand Function and Card Slot - Wallet Etui Cover Pouch PU Leather Flip : Cell
Amazon.com: FDCWTSH Compatible with Samsung Galaxy A5 2015 Wallet Case Wrist Strap Lanyard Leather Flip Cover Card Holder Stand Cell Accessories Phone Cases for GlaxayA500 GaxalyA5 Women Men Blue : Cell Phones