This campsite has 4.5 stars on Google with 773 reviews and overall people seem to really enjoy it. It's a bit less expensive than Canyon Campground at $38 a night (from their website), but it doesn't seem to have laundry or showers like Canyon Campground has.

Also, no WiFi or cell service so download everything you'll need ahead of time! You can download the whole National Park on Google Maps for directions without signal:)