SF Planet via Amazon offers the Vena vFrame Ultra Slim Aluminum Hybrid Case for Apple iPhone 6 in Gold or Metal Red for $13.99. Coupon code "VFRAME50" cuts it to $6.99. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.01.) That's the lowest total price we could find by $5. It features a dual-layer aluminum frame that allows access to all buttons and ports.

Also available for is the Vena vFrame Ultra Slim Aluminum Hybrid Case for Apple iPhone 6 Plus in Gold or Metal Red for $14.99 before the above coupon, $7.49 after. As above, Prime members receive free shipping. (Non-members can spend $35 to bag free shipping and dodge the $6.59 shipping fee.) That's the lowest total price we could find by $7. It has the same specifications as the above case, but is sized to fit the iPhone 6 Plus.