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Fire, a blanket, and a machet.
The price varies from year to year. Last your it cost me $2.50 a gallon. This year it's around $1.30 a gallon. That's buying it for a 500 gallon tank. If you go to a place that sells it for gas grills they are going to rip you. Our tank is outside and no problems. You might want to check with a propane dealer and buy a bigger tank and have them fill it off of the truck. A hundred pound cylinder will last you no time. If you have access to piped in natural gas you would be better off using it.