I came across this site that lists the highest–and lowest–gasoline pump prices in each state and counties, parishes, areas, etc., within that state.
I checked it against my local knowledge, and while it was good, it didn’t list the stations that I know to consistently have the lowest prices. Still, it beats not knowing where to save money.
It’s called Gas Buddy.
PS Unless I’m mistaken, look for gas prices to reach $5 a gallon by the Fourth of July, or shortly thereafter. They’ll come down in September or October for the presidential election and then continue their upward march after the new president is elected.