I've spent quite sometime playing Elderscroll IV : Oblivion. I am currently searching for vampiric cure ingredients. For those of you who played Elderscroll IV : Oblivion and also in search for this cure, I found something that might a help a bit.
You might notice that the witch demanded 5 grand soul gems before she wanted to help you out. Unfortunately, these soul gems have to be the grand one (petty, common, or greater soul gems won't do). You can basically buy this grand soul gems on every mage's guild, but it's gonna cost you about 300 - 350 golds each depending on your haggle skill. I've found a trick that able to give you 3 - 4 soul gems in one row. Head to the mage's guild in Anvil. Wait till late at night when everybody falls asleep. Look for the showcases, there should be two showcases containing several soul gems. This will require hard to very hard lock picking skills, so quick save and load if you screw up. Also note that this is considered stealing, so make sure to use sneak and ensure that nobody sees you. If you save some gold, you should be able to buy at least 1 or 2 grand soul gems from other mage's guild.
