Following the protocol.
The dealership is supposed to provide you with the Costco pricing discount and the actual invoice for the specific vehicle.
My dealership wasn’t showing me their actual invoice, they just printed off some bogus document with their “invoice” pricing…

I called the sales lady out on it, and requested to see the actual invoice per the process and she got defensive and upset. I just went with this other dealership and got a better price than the Costco approved dealership that was trying to swindle me.

I’d like to try it again someday and see how it goes next time.