You can go get one from NAPA, ($150 I think) but it will be a rebuilt and won't last (ask me how I know - I went thru four of them in three years - NAPA provided free replacements but I got tired of changing them.)

I got so mad, I bought a NEW BOSCH from AUtozone, for around $325. MY car had a Valeo, in order to fit the BOSCH, I had to trim the plastic from the back of the housing - but it was not all that hard. I can change a Crossfire alternator in less than an hour now.

As to tools: You need the basic stuff you always need, metric socket set and external torx socket set. YOu yank out the fan assembly first, then take out the alternator, rotating it once you get the bolts out so you can remove the wiring from the back, then "dance" it out past the brackets. Not hard really.