You cannot negotiate a price on a car that does not exist. No VIN, no car, no price.
You can negotiate an agreement to order and buy a car but that agreement will be based upon MSRP or Invoice price the only bench marks available before the car is built. Incentives are offered by GM and are subject to change monthly.
A good dealer will work with you but there is no traditional bargaining as there is no supply/demand in advance.
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