The Max Planck Institute has made available a pre-print for what looks to be an absolutely amazing volume: Markham J. Geller and Klaus Geus, edd. Esoteric Knowledge in Antiquity (TOPOI – Dahlem Seminar for the History of Ancient Sciences Vol. II).
You can download the whole book with no hassles, and everyone looking at the NSEA will find something of interest in this volume! Highly recommended.