I bought my 2013 GTR clean title, FBO, 33700 miles, volk racing rims, pss new tires for 59800 (got in April 2015)
I felt like I stole it.
Small mom and pops dealer sold it to me for what they paid at the auction for it. They had PPI done and I didn't hesitate a second and bought it.
I still have dealers name and number if you interested in checking in with him to maybe find you 2013gtr.
I decide to fly to mitchigen, picked it up and drive it 1250 miles to Florida. Car is now e85 as well running like a beast trying to break high 9s with it this winter
So they are out there. Keep looking and be patient and you can find even 2013s in high 50k low 60k.
Good luck