I use Gas Buddy when prices get high - local prices today range from $3.59 to $4.29 a gallon (all non-warehouse prices available to the general public.)
If one is price sensitive, it’s worth driving a couple of miles (or in some cases, a couple of blocks) to save a few dollars on a fill up.
Yes, Gas Buddy is a great site. It’s currently $3.99 for us at the Kwik Trip.