Drive-in campsites for the Coe Ranch Campground are $20 per night. Reservations can be made through Reservecalifornia.com or by calling 800-444-PARK. Backpacking is first-come, first served. Permits are $5 per person, per night and $8 per vehicle for parking.
It depends. If you bring a car you have to pay for parking, that's $8. If you go backpacking it's $5 more dollars. If you are able to secure one of the few car camping spots, I think it was an like $15 more to camp there. Always call the ranger/visitor center before going to the park for special information.
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