My alternator died just recently.. looked around.. CT $300 .. Ford $290... I went to the shop I always deal with and they got one for Dealer cost which was $170 with 1yr warranty..
Now keep in mind my car now sounds like it has a supercharger with the alternator whine but works fine... try part stores they might have one cheaper..
Or you can order one from Las Vegas (Bill Jenkins stomping ground) it might be considerably cheaper.. even with the cross border fee
cheers