Re: are all parts so expensive??
I have always found with alfas that some parts are very reasonable..and other are very expensive. I would also say that if you had been an Alfa owner thirty years ago then spares prices were astronomical...so Alfa ownership has actually got a lot cheaper over the years. It just doesn't seem that way sometimes.
You do have to shop around as well, and take advice from forum members, there is some good value to be found if you hunt for it, Don't know about alternators though..sorry!
Welcome to AO