Check out the GasBuddy app.
Not only will this app show you the gas prices at the stations near you, but if you register for a GasBuddy account (linking your checking account) you will be able to pay for gas using GasBuddy (drawn from your checking account) and you save $.05/gallon.
I signed up this week and am waiting for my card.
Also, as a follow-up from Tip #1 (1.5.18) - I have received my moviepass.com card and am about to see my 3rd movie this week @ Galaxy Mission Grove Theater using the app (with no charge at the window). See Tip #1 for details. It's our new best friend!