Dealerships are hurting for business. The "Blue Book" value means very little in this market now but rather is more or less a guide for depreciation. If you cut a deal that only requires them to put in a few parts (since the parts are at their cost) and labor for a mechanic who might be reading the paper otherwise, you will likely find they will go for it. If you want to restate the deal, tell them you want to pay in cash if they knock another $500 off. If you pay in cash just take $100's and count it out in front of you in piles of 10. Only let one of the dealership's people confirm your count on each pile. I know someone who paid in cash once and they let 2 dealership people count the money. He told me the money was "accidentally" dropped on the floor a few times on the other side of the desk and when all was said and done the count was a few hundred dollars short! Good luck.

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Problems while owning '99 E430
Continual ABS/BAS problems.
P.S. pre-catalytic convert rusted out at 90k
Ignition key actuation problems.
Gear shifter shift gate issue.
Bad antenna amplifier.
CD changer.
Heated seats never worked.
Biannual air conditioning failure.
Power windows and moon roof.
Leaky valve covers.
Rear power window broke.
Poor rear lamp connections due to bi-metal corrosion.
Maybe my spring perches will fail someday!
Engineered like it's not a car