It seems kind of strange to me that they only marked down the second String Theory book, but not the others. You'd think if they were only going to mark down one book in the trilogy they'd go with the first book, like they did for the Vulcan's Soul trilogy, and not just the middle book.The official page has been updated
Ones that I don’t think have been mentioned already are:
TOS
Vulcan’s Glory by D.C. Fontana
Vulcan’s Soul 1 - Exodus by Josepha Sherman & Susan Shwartz
DS9
Valhalla by Nathan Archer
VOY
String Theory 2 - Fusion by Kirsten Beyer
Seven of Nine by Christie Golden