Endless Grand Soul Gems With Grand Soul
First, join the mages guild by going to any main city other than Imperial city. After you get the guild key, go to the arcane university, south-east of the Imperial city. Walk into the arch mage lobby, and to your left should be a case with Three soul gems in it. Duplicate your lock picks and unlock it. (It is very hard so make alot) Once you get it open take all of them. Two will have grand souls in them. Duplicate as many as you want for selling or enchanting at the altars if you have access.
Added by: Notorious Nick Jul 1st 2011, ID#7429