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I take 20# to be filled local (Bismarck, MO) $14 include tax. Wal-mart $23 for 15# can which is same size. I have not looked long enough to find a means of translating a gallon into large tank w/ 20# hi pressure.Got my yearly tank of propane today 1.74 dollars a gallon. Just wondering what it is around the country or world. Gas is 2.50 a gallon here about an hour outside of Buffalo ny.