[Morgeruat]

my first time through i didn't find any of the conjure elemental scrolls, alot of them are random though, resting where random enemies spawn tends to make them appear more often, also turning up the difficulty in thoes areas helps, as the more dangerous they are, the better the loot they drop (or so it seems), places like the severed hand, and dragons eye drop decent enough spells, but you can always buy mage scrolls from Orrick in Kuldahar, and in the severed hand, as well as a few other places, like the mage in dorns deep