Gas prices continue its slide in Arizona. Triple-A Arizona says the average price of gas fell a cent-and-a-half from last week to $2.89 a gallon. In Flagstaff, gas is down nearly two cents a gallon from last week to $2.83 a gallon on average. Some stations are selling gas for $2.65 a gallon and lower. In Prescott, gas is down nearly a cent to $2.98 a gallon. Some stations are selling gas for $2.84 and lower. Officials say supply and demand continues to impact gas prices. Higher supply has prices at the pump falling, which is expected to continue into 2020.