Sometimes, even the "filling station" will rip you off. I went to the local Amerigas depot a while back to top off a tank that was about 1/4 full.
The guy filled it up (?), then said "tell her 'one refill'." I asked him how many pounds he put in and he said "I don' t know - a fill up is all the same price." Needless to say, I won't be going back there again. My local U-Haul dealer fills tanks and you can see the scale of how much they put in - it sometimes just takes forever to get service.
As an aside, tank "refills" here are about $20 and if you buy the tank, its about $45. On the way home from an event in Mississippi Saturday night, we stopped in Livingston, AL for a refreshment and pit stop and the local c-store/gas station had refills marked at $40 - just the exchange! Rippin' off all the deer hunters, I suppose.
Pat