There is a parts cd, that the dealers get, it deals with all current alfa models (up to 2001)I think. I have one, some of the diagrams are helpful....not much, but better than nothing I guess.It has helped me solve one or two puzzles, and it gives prices (2001).
I did see a workshop manual in a French Hypermarket in July, it was in French (surprisingly) and only covered boxer models, and was about £20. It appeared to be almost on a par with Haynes type manuals. I wish i had bought it now, (I was a bit broke after paying 4 euros per tinny at the GP)it would have been useful for the diagrams, (obviously not the engine stuff as i have a TS, and my French isn't that good, and probably "workshop manual French" is a bit different to what i learned at school (I am okay with groceries)...but I may get it next time I see it - if there is a next time.