Echo Store via Amazon offers the Slicoo Dual-Layer TPU Rubber Cover Case for iPhone 6 in seven colors (Black pictured), model no. SLCS-033, for $11.99. Coupon code "6HW2CQ4E" cuts it to $9.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to get free shipping; otherwise it adds $6.10.) That's $20 off list and the lowest total price we could find. It's made of environment-friendly TPU rubber and electroplated plastic.