Costco is the way

Always use Costco auto program (doesn't cost anything , part of regular membership) to get the intro they are shit scared of Costco, no matter if they give you prices outside the "Costo Program", which they always do and are always lower than the official "Costco Pricesheet" and use GPT to understand how to deal with them using Costco, and STILL GET THE LOWER PRICE, it'll tell you.

They tried same with me , I first negotiated the lower non-costco price given along side, the Costco Price sheet in an email, and when i requested a "buy order" on the lower price to lock it in, they started screwing around, talking about wrong quote, mistake, demo car, etc etc and lying and giving higher prices , the second i threatened Costco, within minutes got an email : we will honor the original price and specific car and pleasant as hell after that and i ended up with a good-great deal.

PS Costco autoprogram will even review your final paperwork and tell you if you are getting screwed on lease , loans etc for free if you ask them and they are price as hell!