Gas prices are starting to go back up in Arizona, however prices remain steady in Northern Arizona. Triple-A Arizona says prices at the pump went up just over three-cents a gallon from last week to $2.46 a gallon. In Flagstaff, prices have seen just a slight increase of a half-cent from last week to $2.61 a gallon. However, some stations are selling gas for $2.45 and lower. Prices are also pretty much unchanged in Prescott, where prices only went up two-tenths of a cent. Some stations in Prescott are selling gas for $2.54 and lower. Officials say motorists should expect to see prices to go up if demand increases and gas supplies start to diminish.