Centergas Fuels Inc

I purchased 300 gallons of propane and found out when I got the bill they are the highest place in town plus they have a extra fees. I check around at two other places one was 2.70 per gallon the other one was 2.60 per gallon. They charged me 2.89 per gallon plus 7.75 for some other charge that I can't tell what it is for. I called and talked to there office and they could not give me a good answer. I told them about the other prices that I had called about .