I don't use propane but you should look into buying your own tank vs. using one from your supplier.
What are you paying per gallon for propane? I have two smaller tanks that are used for a gas fireplace. I take them to the local Ace hardware for fills. Fuel was $2.28 a gallon but has increased to $2.70. I am on the fence on buying a larger tank and having it filled at the house. Many friends are now using SJ Johnson service in Calvert, they have told me of very good service and price.