I am starting to research a 2021 Unlimited Altitude JL. Read a lot about dealer invoice as a starting point for negotiating. I emailed a local dealer and started the back and forth about a specific stock number. They , of course were excited about a possible sale. Then I asked to see the actual invoice for that specific Jeep. RED FLAG! Both the sales guy and sale manager flat out said NO. How can buyers see the invoice or should I just keep shopping other dealers?