Without an MSRP it is tough to judge how much they are discounting the car. Bottom line is whether you are happy with the deal. There are many factors that influence what a dealer will want to sell a car for, like how long it has been on the lot, manufacturer's incentives, and perceived demand for the car. I bought a "new" 2019 with a build date of May 2019 and 42 miles on the odometer. It had probably been around for a while and the dealer wanted to unload it. This was perfect timing for me because it was a color I wanted, panthera metal, with the light gray upholstery package that pleased my wife. The car, a GT2, was advertised on Autotrader for under $40K, and after a few emails, they sent me an estimated offer of under $44K out the door. The dealer was in Ontario CA, about 85 miles from home, and we jumped on the deal and drove out that weekend and took delivery.
Things you need to be concerned with is whether the dealer is not front-loading the price with overpriced add-ons, like paint protection packages, tinted windows, theft deterrent systems, etc., in which case there would be a dealer window sticker with the additional items. Personally, I insist on starting with the MSRP and tell them up front I have no interest in add-ons of any kind. When I bought my Stinger, I asked for an out-the-door price with all costs itemized - tax & registration should be about it for a Stinger GT as equipped. Get it as an email or in writing, otherwise you do not have a legitimate offer. You can then go to your closest preferred dealer and see if they will do any better or at least match the deal. In our case, the local dealers did not have a car like the one we got the offer on, a 2019 gray GT2, so I figured the best deal was to make the drive and get the one that was on the lot in Ontario. Hope this helps.