Gas prices in Arizona have dropped to a four-month low. Triple-A says the average price of unleaded in the state, dropped two-and-a-half cents last week to $3.45 a gallon. Gas prices in Flagstaff remain the highest in the state, but fell nearly three cents a gallon last week to $3.70 a gallon. Gas has fallen over nine-cents a gallon this month in Flagstaff. Unleaded gas in the tri-cities is down three-and-a-half cents from last week to $3.50 a gallon. Triple-A says more the 557-thousand Arizonans will travel next week for Labor Day Weekend, but they don’t see a rise in gas prices for the holiday.