Theprunedanish via eBay offers the OtterBox Symmetry Case for iPhone 6 / 6s
in four colors (Blue-Grey pictured) for $17.94
with free shipping
. That's the lowest total price we could find by $4. It features a bump-and-scratch-resistant polycarbonate outer shell, impact-absorbent honeycomb synthetic rubber inner layer, raised beveled edges, and openings for access to all ports and buttons.