Just picked up a kit a Gander Mountain last week for 18$ dollars and a spare tank for $7, Not sure they had more at the store in Sterling Height, MI. I have not filled them yet with my 11lb tank. Figure a couple of these should last all day in my thermal. I have both an old and a brand new buddy heater, smaller Mr Heater. Fits both. Tanks are a tad taller. There is a valve under the thread that you use an allen wrench to open to let air out while filling. Once propane starts seeping you close it. Think I might repurpose the tank holder in the kit for a small table in the shack. Will hold the fish finder nicely.