The Good Sam website does use the verbiage "select" when referring to Flying J locations that honor the five cent a gallon discount on propane. Individual locations opting out of nationally advertised deals is nothing new. For example, I have seen many fast food locations not honor the national sales prices of pizzas, burgers and foot long sandwiches. When it comes to propane, there is no way it could add up to $1.50 even on the biggest RV. There might be principle involved, but the financial implications are negligible.