Zeus After you have spoken to him, the other gods will be more helpful. Arcadia
Athena Will give you her Shield. Attica
Hermes Will give you his Sandals. In Zeus' temple in Arcadia after you visit Hermes' temple in Argolis.
Apollo Will give you his Harp. Peloponnesus
Poseidon Will sell you his Ocarina for 60 olives. Laconia
Hephaestos Will sell you his Sword for 70 olives. Far west end of Phthia.
Ares Will sell you the Bracelet of Power for 80 Olives. In the maze of Crete.
Artemis She will give you the Moon Crystal. In the northeast corner of Phrygia.