cost to replace an alternator

Granted its 18 months later but the Lexus dealer here in Fremont CA just quoted $740 to replace the alternator on my wife's 2005 ES330. I see the alternator (DENSO) can be bought on line brand new for $145 so can't see how labor can add another $600? Other advise is dead on - always seek out a good private repair shop that specializes in Japanese cars like Lexus.

Diagnosis is probably correct. Lexus list price on the alternator is $344 and it's 1/2 labor, plus diag time. Just cannot believe you're at the dealer! You need to find a good Jap specialty repair shop with a good local reputation. Usual savings are 20-25% of dealer. Make sure that the replacement alternator is DENSO brand; everything alse is just a "rebuild."