Cell.Expert via eBay offers the Carbon Fiber Pattern iPhone 6 Plus Hard Case Cover in Black for $1.31 with free shipping. (A 4.7" iPhone 6 case is available for pennies more.) That's tied with our mention from two weeks ago and the lowest total price we could find by $4 (outside of other eBay sellers). It's made of carbon fiber and leather.

Note: This item ships from mainland China and may take three to eight weeks to arrive.