Not covered by drug plans.
I order 90 tablets of Proscar, the 5 mg version and cut it into quarters. Lasts me for a year. Must see a doctor to get a prescription. Doctors are quite liberal with refills. I don't ask for any more because I don't feel it's necessary to stockpile more than a year's supply.
The active ingredient, Finastride is turning out to be a wonder drug. In appropriate doses, it is a treatment for prostate problems, it lowers blood pressure, and professional atheletes use it to mask other drugs.