These places tend to be extremely overpriced. Don't forget to thoroughly dowse that camp fire. National Parks will not allow you to cut or even gather down wood. You must bring your own. National Forests allow cutting of wood with a permit in posted areas.
Campers can usually collect down wood unless otherwise posted.
State Parks - check with the rangers on fire regulations. Anza Borrego SP does allow primitive camping almost anywhere, but does not allow ground fires. BLM - fires are allowed just about anywhere safe in a rock ring, always use good judgment. Check with local officials for exact regulations. Not allowed in National Park campgrounds areas at all, unless you are a backpacker.