The park where I'm currently parked is an exception but many parks seem to feel they have a more or less "Captive" audience.. So like the 2.50 glass of soda (50 cents elsewhere) at a Movie theater they charge a very high price.
Generally (Again where I'm parked is an exception) the local Propane WHOLESALE place, You know, the place with the really really really BIG tank farm,, That's the place to go.. Here (Oconee County, SC) they are the most expensive. ACE hardware is where I gas up
Roughly 3.00/gallon last fill tax included (just over 60 bucks, 19 gallons on the dot).
True story...Returning to Michigan in 2012 wife had jury duty so we came up I-69 instead of I-75, then hung a left and off to Berrien County (West side of state).. Well arriving in MI I need propane, so Sat AM I called ahead to a propane dealer I'd never done business with but I knew about.. Found out their price (2.69/gal then I think) so, since they were going to be open long enough for me to get there... We went.. The lady wanted to give me directions since the tank farm can be hard to find (3635 14 mile road, Tekonsha, MI 49092)... I finally told her who I was and she figured I could find it.
When I lived there it was a Dairy Farm. (The one I grew up on).
I think my next to the last tank of Propane was around 2.25/gallon in Flint MI back around 11/1.. Alas, I burned an extra bunch of propane this year due to not being able to get out of Mich when I wished. That too was a Wholesaler.
I always recommend wholesalers as the first place to price check.
But the best advice was put into a song back in, as I recall, the 50's.
The Title (And advice): Shop around (My Mamma Told Me, To do the shop around).