Christina, if I am your bible buying a car " whatever transpires " you sleep on it before making a final move. If same offer not there next day,,, like the old saying goes,,, not meanth to be.
At the same time, the dealer may make contact with an even better deal,,, you are the buyer,,, you stay in control.
After visiting all Mercedes Dealers within 25 mi radius, we ended up going back to the original dealer that we visited a couple weeks ago to check their stock. They had the vehicle I wanted listed at $33,900 and negotiated it down to 31500..paying $35 OTD.