The sticker price is HUGELY negotiable. My hp broker can get me nearly any car for a 'nickel deal', or $500 over factory invoice. I just turned this deal for my Mother in California on an 04 LeSabre.
It'* very easy to bluff this deal. And THEN take the incentives
You won't be eligible for all of them with a nickel deal, but you may not need them at that point. Just tell them you found a broker through your wife'* work, and want them to match the deal. They'll do it, as they still turn a profit even if you buy UNDER invoice. They get kickbacks from GM for every vehicle sold.