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Call NAPA in Point Pleasant(Van Wickle Auto Supply)(732)295-4800
ask for Craig, tell him I sent you, he can get them for you. They are anywhere from $150-$275.
The rears at least are a sealed unit with the hub. The dealer will try and grab 400+ for a a bearing assembly that is rediculous. At the same time i personally would not go the Pep Boys route. I know some have had luck but other have had them fail SOON. And who feels like replacing them even if they are under warranty.
I think the best bang for you buck is at NAPA for these. They are usually around 195-200 bucks and they are quality units. Just my 2 cents. No need to buy GM but don't skimp on a wheel bearing it is too important.