Prices at the pump were on a rollercoaster ride this week. Gas prices were up one day and down the next across the state. Triple-A Arizona says on average, prices were up just over three cents a gallon to $2.93. In Flagstaff, prices were actually down nearly a cent from last week to $2.97 a gallon on average. Some stations are selling gas for $2.79 and lower. In Prescott, prices at the pump were up two cents on average to $3.03 a gallon. Some stations there are selling gas for $2.85 and lower. Officials say even though we saw prices change daily this week, we should see some stability and lower prices over the next week or so.