Ending today, Groupon offers the LifeProof Nuud WaterProof Case for iPhone 6 in five colors for $47.99. Coupon code "EXTRA15" cuts it to $40.79. (Amazon charges the same for three colors.) With free shipping, that's the lowest total price we could find by $2, although we saw it for $1 less two weeks ago. It's purported to be fully submersible to 6.6 feet for up to one hour. This shock-proof case is also IP-68 rated for dirt and snow resistance.