Yes, Exemestane is very expensive! I am on Medicare and the AARP pharmacy supplement by United Health Care. I paid nearly $600 for a three month supply. I’ve been on it a little over a month now and the good part is that haven’t had severe side effects so far!! Since I have already bought a three month supply, I’m hoping I can find another pharmacy supplement before I need to refill! I have an appointment coming up with a Medicare supplement specialist to see if he can give me some direction for a lower cost.