Afternoon all!

Right, I'm close to completing the sphere grid with most of my characters but there's one thing that I'm missing in my super stats.....luck.

I ran out of fortune spheres a while ago, and now I can't find any anywhere. I'm wondering two things:

1. What beasties do I need to fight for them to drop fortune spheres?

2. Are there any creatures I can bribe for fortune spheres?

Any help will be muchos appreciated.