Hi to JSWolf,
Each of the books is available in epub. It's just Trifecta (all three in one volume) that's in Amazon Prime.
Here are the links for B&N:
The Necromancer http://tiny.cc/syklx
The Living Image http://tiny.cc/biey4
Midnight Reflections http://tiny.cc/nd51t
Here is the Smashwords link where you can get epub:
Thanks for your interest in the books.