I found it at a Toyota dealership just outside of Philly. I paid about $20,500 out the door for it (tax, tags, etc.). Figure another $400-$500 to get to and from Philly (flight, hotel, rental car, gas, food, tolls). At the time, every MDX at the same price point within 200 miles had 95,000+ miles. I found it on AutoTrader.
And fwiw, I would never buy from that same dealership again. Everything worked out, but I left with a very big distrust in them. Faulkner Toyota was their name.
Outer banks near Kitty Hawk is beautiful and lots to do. Hurricane season runs from June to November, so if you book a place get the insurance. We did a week out there and had a lot of fun. Do the wild horses tour in Corolla - we didn't see any horses but rode around in dune buggies for 1.5 hours on the sand dunes. Also a drive down NC-12 is worth a day.