I found that the new inventory cars aren't really all that discounted. About 6 weeks ago I found if you get an AP2 car with 50 miles, it's considered brand new and it is priced at full retail. You can add or subtract the AP2 software configuration on any car you choose (EAP, FSD) and it will change the price by the same amount that a new one changes with or without the same option.
The 2016 AP1 cars are truly discounted. Since I wanted AP2, I looked at those.
With more miles, the price comes down a bit.
I thought the new inventory cars were priced to sell and I just assumed they were more deeply discounted. What I found was that I'd be giving up the ability to pick the equipment and color but not saving anything at all. It actually took one of the Tesla advisors pointing it out to me since I hadn't compared the inventory car with the exact same new one on the Tesla configuration page. I was just comparing prices and equipment on the various inventory cars.
What you can save is the shipping fee, if you find one you like and you pick it up from its current location.
After spending some time with the inventory system, I ordered a new one.