how about also basing the trip with the boys for a history tour. even if you have to stop for an overnight. find some interesting places along the way. Search the web for cheap motels that have a pool. Sometimes kids just yearn for a pool.
thereare many wanys to go on the cheap. bringing cereal for breakfast, bread pb&j for lunches some snacks and koolaid for drinks. Make it an adventure for the boys. Kids need time away from the troubles of the world. someone said it befoe me. You make the best of your life. Figure out a way.