Always on the look out for decent flip flops. Chanced upon these cork- uppered rubber-soled Gumbies. http://www.gumbies.co.uk/1000-Milers
OK you're gonna have to be in the West-Country to find a Trago Millshttp://www.trago.co.uk/
and then rumble through the pile of other flip flops to find your size, but these are £15 from other retailers and imho a great deal.
There were Black and Green in various sizes including 10s which always seem to go first.