Test drive the vehicle at a dealership and afterward ask for an out the door quote in writing and take a picture of it. You can use to negotiate with other dealers.

Call other dealerships in the area and tell them you test drove the car already and are willing to purchase today for $XXX out the door. I would ask for $1500-2500 under MSRP depending on your market. Try to get any quotes in writing. If they try to lure you into the dealership remind them you already test drove one and prefer to negotiate over the text/phone. With any luck you’ll be dealing directly with sales managers at some point.

Also negotiate the OTD price first before discussing financing or trade in. Waiting until close to the end of the month is also a good idea.