They can be had as e-book omnibus at the UNC Press:
Fergus Millar's Rome, the Greek World, and the East, Omnibus E-book
The Landmark 3-Volume Set That Transformed The Study Of The Roman Empire.
Fergus Millar is one of the most influential contemporary historians of the ancient world. His essays and books, including The Emperor in the Roman World and The Roman Near East, have enriched our understanding of the Greco-Roman world in fundamental ways. In his writings Millar has made the inhabitants of the Roman Empire central to our conception of how the empire functioned. He also has shown how and why Rabbinic Judaism, Christianity, and Islam evolved from within the wider cultural context of the Greco-Roman world.
This is a three-volume collection of Fergus Millar's essays, which transformed the study of the Roman Empire by shifting the focus of inquiry onto the broader Mediterranean world and beyond.