» Sat Jun 09, 2012 8:14 am
Here's the scoop:
For the expert and master level spells, you need to have a skill level at least 10 less than that level spell (75 for expert, 100 for master) before the mage vendors will carry them. So, 65 for expert level, 90 for master. In addition, for master level spells there is generally a quest you must do before you can buy the spells. The quest should be available once you reach 90 skill in that school. Completing the quest usually grants you one of the master level spells, and the others become purchasable at that time.
Character level doesn't matter, just the skill level in the particular school of magic.