PoweraddDirect via Amazon offers a selection of Apple iPhone 6, iPhone 6 Plus, Samsung Galaxy 6, and Galaxy 6 Edge cases for $7.99. Coupon code "VAO7O7KV " drops select models to $1.99. (Eligible models and colors have the coupon noted in the "Special Offers" section of the product page.) Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs around $6.) A couple of best bets, with prices after coupon:

• Poweradd Dual Layer (PC+TPU) Case for iPhone 6 in Gunmetal for $1.99 (pictured, $19 off)
• Poweradd Kickstand Series Case for Galaxy S6 w/ Card Holster in Gunmetal or Silver for $1.99 ($24 off)