Gas prices continue to fall, but is a rise in store? Triple-A Arizona says the average price of gas is down over four-cents this week to $2.90 a gallon. In Flagstaff, gas prices are down around three-and-a-half cents to $3.14 a gallon on average. However, some stations are selling gas for $2.93 and lower. In Prescott, gas prices are down just over cent to $3.10 a gallon this week. Some stations there are selling gas for $2.89 and lower. Officials say as long as crude oil prices stay lower and don’t spike, we will continue to see lower prices at the pump.