Hi There! Rates depend on the services required and the time of the year. All rates can be found on the campgrounds website under the rates section. As you didn't specify dates I can't help but you should be able to find it on the website :)
It depends on the facilities you want. There are sites with power, water and sewer, some with power and water and some without power. I'm not sure of the charges at this time of year but they are very good about answering emails. If I were you I would send an email or call. We had power and water and I think it was about $36/night.
Get an answer from Kimberley Riverside Campground staff and past guests.