What the OP might want to consider are something more like government type parks. Cheaper and no amenities. Some may have electric and water, but that's usually it. Sewer hook ups are far and few in between. That way, you are paying a lower price and have a place to stop overnight. Now they usually won't be a convienent stop off the highway. You may have to drive 10-20 miles to get to them, but one thing you are paying for at a place right off the highway is convienence. You also gotta remember that the owners are usually paying a good penny for the land for that convienence.