$9 last time.  Some places have a minimum charge, which might have gotten you.
Edward

At 08:21 PM 5/22/2005, you wrote:
>I usually fill about twice a year all ways at the same
>place.  For years it has only cost between $2-3 to
>fill depending if empty.  Last time they wanted to
>charge me $20 (the cost to fill a 20# tank).  How much
>do other pay to fill the Westfalia tank?