My ch. 21 city on EN3 has been trading just about anything in inventory for spell fragments for quite a while now. I am constantly running out. Tinlug manages to keep me afloat for CCs, but a smaller city just can’t do enough tournament provinces to keep up. I am very slowly upgrading the Vallorian School of Sorcery, but will probably stop soon (currently at level 12), as the costs just outweigh the rewards. I did try the Antique Shop, but stopped at about level 8 - it’s not worth the cost of upgrading, but I also don’t want to trash it and lose the resources invested.