Greek Lexicon of the Roman and Byzantine Periods (from B.C. 146 to A.D. 1100)
"Sophocles' Greek Lexicon of the Roman and Byzantine Periods fills a needed gap in lexical resources for post-Classical Greek.
To this day, it is one of only a handful of lexicons that covers the Koine and Byzantine periods of the Greek language."
And that's just one of the four excellent volumes in the collection:
http://www.logos.com/product/8513/e-a-sophocles-collection
Right now the CP price is $20 for all four.
That's $5 per volume.
