I was online looking for a 11 pound propane tank on Home Depots sight, when I came upon a refillable one pound DOT certified tank. I believe it ran around $12 and there is a kit to use larger tanks for refill. I have never messed with refilling the disposable one pound green tanks not trusting there valves. I might pick one up and give it a try I hope the method for refilling is simpler than the green bottles.