First of all, it is not recommended to go to a beauty salon for double eyelid plastic surgery. Beauty salons are generally not qualified to do medical beauty, and most people who do double eyelid surgery are people without medical background. Accidents are prone to occur. Secondly, for simple operations such as double eyelids, there is little difference between normal hospital expenses and double eyelid expenses, and it will not be much cheaper because of beauty salons.