Gas prices in Arizona this week are unchanged from last week. Triple-A Arizona says the average price of gas stayed at $2.77 a gallon. In Flagstaff, gas prices actually rose a cent on average this week to $2.99 a gallon. However gas at some stations is selling for $2.75 a gallon and lower. In Prescott, gas prices were down a cent to $3.00 even this week. Some stations are selling gas for $2.89 and lower. Triple-A officials say they see prices being lower over the next few weeks.