there should be some in the cheydinhal mages guild. in the boss's room in the basement
already got thoses for another mission it was for ummmm to get into the arcane uni
if you have to have some, go make some, find a necromancer alter, theres one in the front of a fort just north of kvatch, and have some empty grand souls gems with you, wait until there is a light over the alter and make sure you have a soul trap spell, place the gem(s) in the alter then use the spell however many grand gems you have in it and there you go, your very own black soul gems, and i know this works, i made some myself.
[Edited by erlltheskwerl, 3/18/2007 5:33:29 PM]
Sorry, but where do you get soul trap spells from, thanks.
[Edited by vonfuzzball, 8/13/2007 2:06:02 AM]