Previous cheapest was £12.41 delivered at Amazon a few weeks ago...
In my opinion, this is the best scratch protection case available for iphone, and adds virtually no weight or bulk to it. I've had 3 or 4 different cases and this is the one I settled with (having paid £19.99 for it, I'm shocked to see it for £10.95 now!)...
Measuring less than 1mm thin, Feather is ideal for the iPhone user seeking inconspicuous, first-class protection. Feather is made of an ultra light, ultra strong polymer for light as a feather, form-fitting durable protection without the added bulk. Feather features a soft touch matte finish and includes 2 surface protectors and a cleaning cloth. Feather by Incipio is so thin that it allows the iPhone to be used with many of the docks on the market.
Ultra light, ultra strong polymer
Less than 1mm thin - for superior protection without adding bulk
Soft touch matte finish
Light as a feather, form-fitting durable protection
Includes 2 surface protectors and a cleaning cloth