ThePruneDanish via eBay offers the OtterBox Symmetry Series Case for iPhone 6 / 6s
in Blue/Grey, model no. 77-50889, for $14.98
with free shipping
. That's the lowest total price we could find by $5. It features a bump- and scratch-resistant polycarbonate shell, impact-absorbent rubber inner layer, raised beveled edge, and openings for all ports and buttons.