Okay, so I have some texts by Nietzsche, Sartre, and Kant. But I'm really looking for something directed entirely on free will/determinism, any suggestions?

Read about Advaita Vedanta, read the works of Rumi, and also "The End of Time" by Julian Barbour.

Sorry, none specificaly about free will, but intersting none the least. All exellent pionts on the subject.

Perhaps you might also try Crowley.

If you do a search you should come up with they're bits on the subject anyway, and might find the books your looking for then too.