A very enjoyable place to stay that is very close to the entrance of the Badlands park and the "town" of Interior. Nothing fancy but priced right and run by a very nice family that started it up many years ago. Wi-Fi was available, but you need to be in one of the sites close to the office. Rates were $16 dry camping, $22.50 full hookups with 10% off for Good Sams, AAA, etc.
This campground is apparently closed. I called both phone numbers and sent emails with no response. We ended up camping at elsewhere and were very happy. People I spoke to in the town of Interior were not surprised that "Badlands Ranch & Resort" had gone out of business as it had a very bad reputation in the town.