Corn, of course: where can I get them in the general vicinity of Tacoma? Actually, I'd be interested in Seattle area outlets too.
The Mexican grocery in Pike Place Market sells them. It's located near the original Starbucks.
Guadalupe Market at 1111 SW 128th Street (corner of Ambaum) in Burien makes them in the store. I've bought them still warm...yummm!
If I were you I would drive to La Tarasca in Centralia and order their homemade tortillas - the best I've ever had.