The "fix" that devs made for the "bug" they introduced some days/weeks ago turned to introduce a new "bug" that makes all the spellbooks and runebooks impossible to store on a vendor as "not for sale". That means, all the spellbooks and runebooks that were stored on a vendor as not for sale are now for sale with a random cheap price.
I just saw how some hidden guy just bought tons of old runebooks "made by", "[exceptional]" and probably the html runebooks too, from an ATL museum.
Sadly, the devs does not play this game or test the code they write on production shards.