Was looking for a waterproof case for my iPhone 5S and came across proporta amphibian waterproof iphone 4, 4S, 5 & 5S case available for £19.95 in proporta website. Usual price is £29.95. It can be potentially even less. If u register for newsletter in there website you will get a 15% off code plus 12% cash back. Also free delivery on orders over £20.
Good reviews of the case in both there website and amazon.
Just ordered mine.