I came across https://markups.org https://markups.org, in my research, which crowdsources info on dealer markups. It will give you a ballpark if a dealer should

I came across https://markups.org https://markups.org, in my research, which crowdsources info on dealer markups. It will give you a ballpark if a dealer should be avoided outright. Calling the sales department and asking for market adjustment and dealer adds info for make/model is also recommended. Most sales people, although not all, will disclose rough numbers.