If you do a lot of road trips without set itineraries (VW Bus life
), there's an app called "Camp & RV" by Allstays that shows various and assorted camp grounds, gas stations, supply places (Walmarts, camping supply places, etc.) based on your location. We took our honeymoon in our '62 bus, and used it extensively to find cheap/free places to camp and such. Don't leave home without it. I want to say it was around $5-$10.