I agree with qcloss, we were going to Delaware to see the daughter but after looking at the price's per night we turned around in Ohio at a KOA which was $45 a night pull thought full hookups an headed back home ...
I you have the KOA book or on line it shows you what they have, the more things they have like pools an bikes, cabins etc the cost will go up per night, also the amount of people an animals as well...
We are at a campground outside of Rapid city that is just as nice as any KOA we have stayed at an has more features like covered picnic tables an extra water at each site, large game room, large meeting room, very nice laundry building, fire pits at each site, pool, cable TV, wifi an a large number of 50amp pull thoughts for only $45 a night plus tax an they show you to you site an make sure your lined up so you have no long runs of your hook-ups. Also lots of shade tree, owners are really nice folk an the park is neat a clean along with well kept ...
The KOA at Rapid City is ok but can't come close to this park we are staying 8 miles further down the road ...
Safe travels