Here in South Florida, FPU (Fl Public Utilities) charges a grand total of $5/gal. It's around $3.99 plus delivery fee and other fees. You must pay a monthly charge for their tank and cannot change vendors.
I got so annoyed, I had them pull out my 250 gallon underground tank, right after they filled it, against my specific directions, and billed me nearly $1000.
The refused to give me credit for the propane in the tank and continued to try to charge me, until I contacted the BBB. After which, they immediately sent me a check for the entire quantity of the tank.
I purchased 2ea. 60 pound tanks, some proper straps, poured a pad, and mounted them against my house, nice and neat. I pay $2/gal locally when I bring the tank to the distributor.
Yes, the underground tank was nicer. But not at those prices, and not with the monthly tank bill. I use about 30 gal/year total.