Collin,
I agree with Rybak's recommendation but ... if you decide on some that you find there, I'd check carefully online to see if they can also be found from other sources. In my opinion, TheoBooks charges outrageous handling fees (which they tack on to the shipping charges). It's been my experience that purchasing the same materials elsewhere is almost always less expensive. (I'm actually glad that this subject came up because it reminds me that I wanted to point this out to the powers that be at the Eparchy.)
Depending on what you're looking for, you might also want to check out the website of the Greek Orthodox Archdiocese. It has some excellent materials, directed at children and young adults, particularly its series on icons, as I recollect.
Many years,
Neil
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"One day all our ethnic traits ... will have disappeared. Time itself is seeing to this. And so we can not think of our communities as ethnic parishes, ... unless we wish to assure the death of our community."