3 big repairs soon on '94 wagon

I am going to have three repairs done soon.

1. The fan bearing

2.I think my driver's side ball joint is on its way out. ~$800

3. I hear a hole in my exhaust or muffler.

The question is what can I expect from the muffler as far as cost? The hole sounds like it is aft of the center muffler. Are they sectional or is it a tremendously expensive single unit from the cat to the end?