Amazon offers Prime members the LifeProof Fre Waterproof Case for iPhone 6 in Light Cobalt/ Dark Cobalt for $31.91 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.16.) That's the lowest total price we could find by $8, although we saw it for $2 less in January. It purports to be fully submersible to 6.6 feet for one hour.