Is there a great resource to find good ghost writers?

Try elance or guru. These are freelance sites where you post your project and they can bid on it.

There are a lot of sites dedicated to writers. I would try to go there.

We found a ghost writer by using Craigslist

You may want to reconsider using a ghost writer we have to spend almost as much time reworking the document than if we wrote it ourself.

We have been very happy using a ghost writer I think like anything else it is all in who you use