Where can I get Delphi Limestone?

The only place I know where to get it is from the Trade For Delphi Limestone quest in Mycenae. The only problem with that is that it only rewards you with only 2 Delphi Limestone units and isn't repeatable after hours has elapsed.|||

I think that's the only way to get it.

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Uhhh...you might try looking in Delphi???

...Um?, never mind, the city disappeared mysteriously during the last wipe...