I dont know if this was posted before because i've seen many ppl do it, but theres this place in the northwest part of silithus where there's a lot of enemies called "Dust Stormers". Since all they use is magic, a mage with improved dampen magic (arcane talents) the dust stormers will only do 1 dmg per hit. So you can aoe about 6 of them and not get hurt! I've been using this for a while and i've made 1000's of gold from it.
Enjoy!