You can check ebay, there is a company that rebuilds them for $90 plus $15 shipping. My cd pack (the changer portion of the radio) went out about 6 months ago. Instead of having mine rebuilt for $105 I just bought a rebuilt Lincoln unit for $109. That way I can swap the cd pack into my ford unit and sell the Lincoln unit as non-working, maybe get $20 back on the deal. Less than the rebuild and a lot quicker.
However, search around here for clearing cd errors, it might be a simple fix, or not. Mine had jammed cds. Replacing the cd pack is extremely easy, I'll post a write-up when I get the replacement in a few days.
As far as will the cd/tape combo work....it should for audio but if you have a DVD or sub you very well might lose those.
Adding: Of course, if I find the replacement head unit I'm really looking for I might sell the whole lot