When I lived in NY it was $7 a car, or $50 something for an annual pass. Well worth the money, as the many state parks around Ithaca were gorgeous (
), and we used them all the time for hiking and swimming. (Even in the winter, for snowshoeing.)
I don't go to state parks in Ohio nearly as often as I did in NY. There just aren't many near me. Stonelick, Caesar Creek, Hueston Woods ... ? Regardless, I think $5 a visit is cheap.