Many cities in Montana have gas prices far below $4 a gallon, and you don't even need to fill up at a Costco or Sam's Club to find it. Regular gas stations (as of April 13th) are showing prices as low as $3.67 a gallon.
The Russian invasion of Ukraine has wreaked havoc in oil prices, and consequently in gas prices at the pump here in Missoula, and throughout the country.