User blog comment:Jarcellon/Soul Farming Locations/@comment-4511886-20130405061516

If co-op is ok then I think that either the Gargoyles, Iron Golem or Ornstein and Smough fights are good. All of them are co-op friendly and the Golem and Gargoyles can be soloed by the NPC summons (Tarkus can even solo the Golem in NG+). If I remember correctly, the rewards are 5k, 20k and 25k souls respectively.