The funny thing is like a few countries round the med Cyprus, Greece ,turkey Spain etc there is no supermarket culture in greece. Last year i went to kos and the thing that really struck me was how expensive the local shops are ie £1.20 bread 60p bog standard baked beans the prices were at least 40% more than the uk and up to 100% more. I did find a newly opened lidl on the island and that one shop saved me loads. The locals always seamed to be getting a poor deal and really suffered