I'd rather buy some Greek products that I know will make it back to Greece and help their businesses. I think that would help them more, and help me too. But, I'm not really sure how to do that.
Go to your local specialty foods store and look for things made in Greece, I guess. Olive oil and cheese would probably be a good place to start. I can't recommend the wine though, they tend to put pine resin in it for some reason.