Greece plans to buy three corvettes at a cost of about 1.5 billion euros ($1.6 billion) for its navy and wants some of them to be built in Greece. The initial agreement with Fincantieri includes building two corvettes with the option for one more at the Elefsis Shipyards along with the necessary upgrades and the transfer of know-how and technology at an estimated cost of about 80 million euros, the ministry said.