Here are some examples using actual vehicles and the same MSRP from differing dealers.
MSRP Invoice GM Supplier (GMID)
29500 28075.75 27599.43
29500 27942.65 27599.43
29500 27858.74 27599.43
29500 27908.58 27599.43
29500 27931.08 27599.43
29500 27207.70** 27599.43
**No Advertising in this invoice
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