You can find ceramics at the folowing places:
Benaki Museum Shop, Peiraios Str. 138
Theatre Fournos Mauromichali str. 168, Athens
Museum of Cycladic Art, Neofitou Douka Str. 4, Athens
Attilio A. Papandreou 3 str. Gyfada
Attilio shop Sof. Venizelou str. Ilioupoli
The Oracle, Mnisikleous 8, Plaka, Athens