you could go to pick n pull or something and get one for 30 bucks or check cl parts section. any fwd 3800 gm car will work. i've seen pretty much brand new alternators at the scrap yard. i would, however, put one on before you buy the car just to make sure. its not hard to do. take the belt off and 4 bolts including the bracket that is bolted to it. unhook the power. 20-30 minutes and you're off.
you'll need a 15mm for the belt the alternator. a 13 mm for the bracket. and a 5/16 for the battery. maybe a 10mm for the power cable that hooks to the alt. and a screwdriver to unhook the plug that goes to the alt.
