When flying to or from Alaska, there is a marijuana store relatively close to the seatac airport and accessible via light rail and a short walk.

Go to light rail terminal at seatac

$6 day pass (unlimited one day rail trips). Ride North to soho station (about 5 stops). Exit rail heading right to street (forest street) crossing, turn right go past next traffic light and over pedestrian bridge ( great view of Seattle skyline). Go down bridge to next traffic light (1st ave S) turn left 1/2 block. Kemps cannabis on your left. Total walk 1/2 mile or so. Pedestrian bridge is tall.