Clear Flexible Protective Case isn’t the absolute least expensive protector we’ve seen so far — that distinction belongs to Monoprice’s cases — but it’s unquestionably at the low end of the price spectrum. It’s directly comparable to Case-Mate’s Gelli and Case Scenario’s Keith Haring Crystal Case, minus the rear designs. Instead of being totally clear all the way around, there’s a frosted layer that softens the hue of the iPhone…