Well, the 960 is going to be 2 years old this New Year. With more powerful GPUs coming in, the price for it has dropped. However, it has stabilized around 200$ today. It's still a great choice for a mid range 1080p GPU. I would advise you to set the starting price at at 200$, since it's used. If you can get a buyer, good. if not, lower the price no less than 180$. That should do it.