This is all dependent on the experience of the practitioner and the location of the country. I suggest going to someone experienced and not a run of the mill location. Best, Dr. Emer.
In my hands, it would be unusual to give more than 50 units in one treatment for the three areas that you mentioned. Typical cost for 50 units in my office would be approximately $600. You can always do a touch up procedure and add more later if needed, but you can't take it out if you inject more than is necessary. That's my philosophy and it serves my patients well.