GasBuddy – finds best gas prices where ever you are -- This superb free app, GasBuddy, finds the cheapest gas prices on the go or at locales you know. GB is my BFF and he wants to be yours too. When gas prices rise at a rapid rate, large price discrepancies in a region become more prevalent. Right now GasBuddy is showing that there’s over a 40 cent price differential within a couple of miles of me. Fill up a tank and that adds up.