You usually don’t have the full details of the deal and why they were able to get the price they did. Maybe they got hosed on the trade-in or financed with questionable credit through the dealer. You might pay below invoice, yet still provide the dealer with big profit. Then sometimes with stair step dealer cash incentives your sale might be worth thousands to the dealer as well (i.e. dealer has a certain sales objective on Silverados. if they sell 10 it’s $100 per, but if they sell more than 10 it’s $500/unit applied to the previous 10 as well. That dealer is going to give that last Silverado away to hit his sales objective) Best advice I can give is to try to buy at month end close and be ready to walk way from at any point in the sales process. Impulsiveness will cost you money.