Selling car with gear damage

Hello, where is it best to sell a vehicle with gearbox damage? There are many ads on the net. Does anyone have experience in how far these are serious and you still get a fair price? So suppose the vehicle is otherwise in good condition, only the gearbox would be broken. Thanks already for your answers. Vehicle would be a Skoda Octavia, 6-speed, BJ 2014 Greeting Mario