Lakemont Amusement Park In Altoona, PA. They are a seasonal park, but 2022 prices for all day unlimited rides was $19.95, with a group rate of $15.95, plus a pay-per-ride option, where most rides were $2-3.
It is not a big park, but it IS home to the oldest (operating) wooden coaster. (Though I should mention it was not in continuous operation. It was restored and reopened.) It is a National Historic Landmark, and was built in 1902. It was featured on a history of roller coasters documentary I watched some years ago.
Knoebel's, in Elysburg PA still offers FREE park admission. They offer a ride all day unlimited pass for $50, or pay-per ride $2-$4, with some kiddie rides only $1.50. They also offer some historic rides, including 2 wooden coasters (one dates originally to 1947.) they have a 100-year-old carrousel, tea cups, and an Astro Orbiter.
It is a shame if you have not heard of these two parks due to their historical value.