They are out there but becoming more rare every day especially with the glass roof. I had a 2014 but had to give it up unfortunately and will get into another 13/14 next year some time after my house is done. I have been following all sales of 13/14 GT500's for over a year now. There have been some great buys at great prices recently on one owner originals and they are all being bought up. Just have to keep an eye on all the "for sale" online sites every few days because new ones show up all the time. If I do come across the impossible that you are searching for will let you know. Good luck with the hunt.
Thanks. Hopefully, I hoping get lucky and the price will drop but I doubt it. Seeing that the 13's/14's might be the last manual transmission Shelby, this car will probably turn into a collectible in the future. If only this grey car had a glass roof, I would have given the dealership whatever they wanted.