I think I paid about 70 for a 6 month supply. Might be cheaper to buy it in bulk I guess. Or depends on what kind your doctor writes you a prescription for.
Generally they always write the prescription for one year to ensure that you come back and get a pap smear, checked out and make sure that your birth control is actually working for you. You would be surprised how many women stick with the same pill even though it makes them depressed, pimply, fat, lose hair, no sex drive, whatever. The doctor just wants to get it right, and you should too.
You might want to check out English speaking Ob / Gyn, Zurich
too or do a search on gynos on the forum. Good info!