I sell all of my junk XR subraces, a lot of it for non-XR items:
Examples of trades I have done:
1) The individual is farming me 20 Illithid runs, using my Mindstills, and giving me all the loot. 2) Two Half-Celestial and a Spell Penetration Artifact 3) Two Salamander Daze, a Salamander Listen, two Ranger 3333,4444, x50 24 Lockpicks, x50 Half Bios, x50 Apport Arcanes, and an OC/DC Longbow Item.
I am open to unique trades and unique ways of selling these books so they don't rot. If you'd like to be included in conversations to purchase these books, let me know.