It's all about timing. You can buy cars below dealer invoice. I've done it.
You have to consider this. Lets say a dealer buys 10 cars. Lets say for argument sakes, each car is $20,000. Now, over the next month, they sell 9 of those cars for a minimal profit of $1000 each. They've made $9000. So, if the 10th car is sold $1000 below cost, the dealer loses a $1000 and makes an overall profit of $8000. Now, mulitply that by a lot more cars and a lot longer selling period. Early in the year, prices are high and getting deals is harder.
Pretty simplistic but as cars sit in dealer showooms, other profits are applied against the cars invoice price to artificially lower it. All dealers do it and that's how you get below invoice pricing on rare occassions.
End of model year, or in the case of a Z, winter approaching and you can get them at a much better price point. I bought mine in September pretty much at invoice. If I wasn't dead set on white, I could have gotten a yellow one slightly below invoice for the exact reasons stated above.
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