Waterproof iPhone 4s Case

Does anyone know of a good waterproof iPhone 4s case? My friend has a lifeproof case but complains of the screen protector. I saw one on kickstarter that is similar but doesn't have a screen protector.

http://www.kickstarter.com/projects/1051696088/meet-nautilus-amazing-waterproof- case-for-iphone-4

but before i place an order I wanted to see if there was anything else out there comparable.