Best Buy offers the Dynex Metal Effects Case for iPhone 5 / 5s in Silver, model no. DX-MA5DB25, for 99 cents. Opt for in-store pickup to dodge a $2.99 shipping fee. It's the least expensive metal iPhone 5/5s case we've ever seen; similar cases go for at least $5 elsewhere. This brushed-metal case features polycarbonate and aluminum materials.