When I was working the dealerships on my order and it was down to three, I had one that simply refused to give me a number, kept asking me what other dealers were offering.??!! He kept making excuses about not knowing rebatres etc. I said I don't care about the rebates, just give me a price. After several conversations, I pretty much went off on him on the phone for not giving me a price. When I later received an email from the dealership on a follow up, I blasted them as to why I bought somewhere else.
FWIW, I did 100% of my negotiating via email, phone calls, and text before making an appointment to put in my order. The dealers that were willing to play didn't have any issue emailing me their invoice sheets. That said, I also called each dealership and asked for the email and phone number for their fleet or sales manager and dealt with each of them almost exclusively. One or two punted me to the "internet" sales associate.