Our experience was fully at one dealer. We went in asking about used and new, and he worked up a price for a new because at the time there were no used conv's available. He said he had two slots allocated to them and quite honestly, if we didn't make a decision in a day or so he could give the slot to the next person through the door.
We thought about it overnight, and the next day went back (probably a Saturday). he checked, still had both slots, and sure enough, the very next person through the door sat down at the next desk, and looked at the sales guy and asked to purchase the exact same car we were getting, thus taking both slots. He never asked the price, just listed out what he wanted, the calculator whirred, and he wrote a deposit check.
The sales guy commented how this was the easiest car line he ever sold, most people coming in are ready to buy and don't need to be sold, know what the price should be, and as long as it's close don't argue.
Either that, or it was the free floor mats they toss in.