The Cygnett WorkMate Pro retails for $19.99 and is a two layer case with silicone and polycarbonate to protect your iPhone.
More after the break.

The Workmate Pro is available in two color combos black / black or orange / black. The workmate is a great case and at $19.99 they include a screen protector you will get the same level of protection as a case that sell for twice as much. I would recommend the workmate to anyone that is looking for a great rugged case.