Gas prices were up nearly three-cents a gallon on average this week across the state. Triple-A Arizona says gas prices are $2.91 on average in Arizona. In Flagstaff, gas prices are up nearly five-cents a gallon to $2.98 on average. However, some stations are selling gas for $2.75 and lower. In Prescott, gas prices are actually down nearly two-cents from last week to $3.00 a gallon. Some stations are selling gas for $2.85 and lower. Triple-A says the market is adjusting to lower gasoline stocks, so we could see prices go up further over the next couple of weeks.