Gas prices are down across Arizona again this week. Triple-A Arizona says the average price of gas fell about a cent-and-a-half this week to $2.80 a gallon. In Flagstaff gas is down about a cent-and-a-half on average to $2.75 a gallon. However, some stations are selling gas for $2.57 a gallon and lower. In Prescott, gas is down about a half-cent to $2.90 a gallon on average. However, some stations are selling gas for $2.84 and lower. Officials say expect prices at the pump to continue to fall for the foreseeable future.