Just my 2c, IDK if it will help.
I bought mine used from a big car brand dealership. This was also my first self-owned car.
-Just as a family tradition, we always buy used cars from dealerships because they usually give it a full inspection and prep it like stock. Gives a better feel rather than buying private sale where you are really trusting the previous owner about the car. Some dealerships may have warranty included, which doesn't hurt.
-In hindsight, a lot of the FRS I found at dealers were lemons, ding'd up, chipped, repainted and repaired for various accidents. Mint ones are not easy to come by. I did some post-searching for private sale cars and some of them seem could just be as good of a deal if not better, so don't count them out. Also, dealerships tend to sell high... and some dealerships are quite shady!!! (even big name dealerships)
-When you see the right car, you will know it. You can tell when the car has been cared for. As much as you want the twin now, don't let the eagerness affect your purchase decision and
be patient. Don't settle for a lesser car.
-My car was not mint, but for 2013 it was in really good condition and repaired pretty well. As long as you can accept it, take the risk go for it. My car has had absolutely 0 issues. You obviously want to be extra wary of things like bumpers repainted/unmatched, panel deformations, missing parts of car, bring someone who can really detect that sort of stuff for test drive.
-You
will want to MOD this car when you get it. And this is coming from someone who likes the stock look. Stock allows you to appreciate the car even more as originally engineered and will make modding even more rewarding. If you buy a pre-modded car, you may feel like the car is not your own. If you don't mind that though, pre-modded car will save you $$$.