Earlier quoted context omitted.
You could sell the car yourself, and get financing from a bank. Then its only price (fixed), and addons.
I've found (in the US at least) that automaker financing on new vehicles is usually better than any other banks. I'm now wishing I put zero down on my last car, because it's looking like my loan is way cheaper than inflation is going to be over the life of the loan.
Of course in the end if you have options you need to run your own numbers. Things change far too often to give general advice.