I’ve used this the past few times I’ve bought to find what I was looking for.
(Some of us remember when it used to be a monthly book you picked up at the convenience store.)
https://www.autotrader.com/
It helps you find vehicles out of your immediate area.
Don’t hesitate to use Advanced Search.
I’ve even had distant places offer to take the car to me to see. (Helps if they’re in a somewhat remote location.)
In the past I’ve used Mass Buying Power which was a predecessor to the
AAA and Costco programs.
You bargained (or not) up from invoice cost, rather than down from MRSP.
Haven’t bought anything since Covid, though. (And hope I don’t have to!)
Good luck!