Welcome to the forum from California
I'm sure someone on the forum will be looking to peddle their Air 2 soon. You can check their previous post to make sure they haven't had a rash of crashes or complaints. I really would only trust buying from a established forum member..otherwise it's a pig in a poke.
These DJI drones are high quality, all of mine fly just like they were new and so...if the price sounds too good to be true...give it a pass. Good luck and happy flying!