Yesh, you forgot that Malboros, Forbiddens, Grand Mantises, and Imps drop Curse Spikes as well. That, and you can refine them from Tri-Face cards. :/ Maybe I'm just obsessed.

Anyways, Occult Fan Magazines are found (I-IV) in the Balamb Library, the backroom in the Pub of Dollet, from the Master Fisherman, and from the Presidential Secretary in Esthar respectively.

Name at leas two entities that you can draw Aura from.