I want a Model S but your car was really making me second guess that decision. Now that it's sold it makes my decision easier...lol. mind if I ask what price you sold it for? Feel free to PM me if you prefer.
The only way you're going to get Unlimited Free Supercharging (UFSC) is with a 2016 or one of a very few early 2017's. Everything after that the UFSC won't transfer to a new owner.
Even some 2016/2017's if they've been sold back to Tesla and sold as used they can have the UFSC removed.
I'm in the market as well, looking for 2016+ P100D or 100D. I've been to IdealMotors in person and they were friendly and willing to help. Weren't your typical car salesman following you around and pressuring you. UFSC isn't a deal breaker for me but would be a nice bonus if it's included! Good...
You're only going to be able to get a 2016 or a few weeks of January 2017 cars with unlimited free supercharging (UFSC). Anything made after that the UFSC does not transfer.
If the car was traded in or purchased from Tesla as a used car the UFSC most likely won't transfer to the new owner...
I agree with CapeOne, with that mileage it would be at or below that price used from Tesla which includes an extra year of warranty.
I'm in the market for a 2016 or 2017 Model S P100D and have been watching the market since fall last year.