The average price of gas stayed unchanged across Arizona for the second straight week. Triple-A Arizona says the average price of gas is $3.11 a gallon. In Flagstaff, the average price of gas rose four-and-a-half cents from last week to $3.37 a gallon. Some stations are selling gas for $3.29 and lower. In Prescott, the price of gas rose nearly two-cents a gallon to $3.13. Some stations are selling gas at $3.04 a gallon and lower. Triple-A spokesman Aldo Vazquez says a rise in supply is keeping gas prices at bay. He says “despite an increase in demand, motorists are not seeing significant pump price jumps” because of the rise in gasoline stock levels.