This newsgroup thread from November 1999 talks about having to go to OOT for them, but one post mentions the Erudin library so it's not definitive.
https://groups.google.com/d/topic/al...nvY/discussion
Here's the thread with the kos DE magician:
https://groups.google.com/d/msg/alt....w/POjdA9lDj28J
Here is another one with a DE getting owned hard trying to get them. Had to roll an alt and get him to OOT. Might not have done this if he could get them from Erudin:
https://groups.google.com/d/topic/al...jNg/discussion