The website is a handy and helpful tool, worth checking before you head out to fill up your tank. Differences in prices can vary up to 20 cents a gallon between stations only a few blocks apart.
You simply type in the name of the city or area where you want to check prices and the stations (and their prices) pop up on a Google map. For the record, if you're willing to drive to West Memphis, you can save a bunch. Check it out.