Gas prices are still heading lower going into the Fourth of July weekend. Triple-A Arizona says prices at the pump are down two-cents a gallon across Arizona. In Flagstaff, gas is down two cents a gallon to $3.12 on average. However, some stations are selling gas for $2.89 and lower. In Prescott, gas prices are unchanged, staying at $3.10 a gallon. Stations are also selling gas for $2.89 and lower. Officials say the dip in gas prices may begin to level off after a rise in crude oil prices and demand coupled with lower supply.