You are going to spend anywhere between 1500 and 4000 dollars depending on what is wrong with your transmission. If it is just some bearings and gears it is going to be on the cheaper side but if it is going to be the entire transmission it is going to cost a lot more.
i cant give you an exact number but i think that it will be between 1000 and 5000 $ according to type (automatic or automatic )and to the situation of your transmission