Originally Posted by AirMiles
I second Tractor Supply for a source of propane by the gallon at fair prices. This is my new "go-to" propane location. There's a lot of them around the country.
+1 on Tractor Supply, but call first and ask if they sell it and also if they fill tanks. Some only do the tank trade for the smaller tanks. Some don't sell at all. But many do refill tanks and for me the best way to go.
On Sams and Costco we have both memberships. Some places only have one or the other, some none. Some of the merchandise is locally dependent so you may find something interesting in one store or the other as you travel. At the Costco in Bend Oregon, we found some great organic tamales with simple, pure ingredients we could never find anywhere else.