My father in law bought new hearing aids- digital that go outside the ear whilst in Turkey. From The Medical Centre-sounds a big place but in actual fact it is quite the reverse - a small shop on the top road in Fethiye on the opposite side from HSBC bank and the big Beko shop.
They were much cheaper than the UK and a lovely chap in there who speaks excellent English-he took him to the Esnaf hospital for the hearing tests-father in law said the most through tests he ever had.
Hope that helps.
Jo.