JWR,
I noticed that the 1-pound propane cylinders are currently on sale at “2 for $5” at Wal-Mart stores. This is the equivalent of paying $50 for a 20-pound tank, which are normally between $40 and $50. The economies of scale have made these 1lb. propane cylinders relatively inexpensive, and they have numerous benefits [in some applications] that you don’t get with the larger 20-pound cylinders.
One of these 1-pound cylinders will run a Camp Chef oven for 7 or 8 hours for baking bread. – Jeff M.