You need to specify what kind of camping. Tent, cabin, rv.
Be sure to sign up for the Ohio State Parks rewards card. Mohican State Park does book early for Memorial Day through late October but people do cancel. It about $30 per night. During the summer months we prefer Mohican Wilderness on Wally rd. More expensive but you are more likely to get in plus the sites are huge.
It's on the state park website and it varies based on site and amenities. It is reasonable though and this park is well worth the money. It books almost a year in advance though. They have a limited number of walk in sites.
Thanks! Your answer is awaiting moderation.