If you want fresh masa, you're probably going to have to make it yourself from nixtamal or try to get a tortilla factory to sell you some, which is unlikely to save you any money. Homemade tortillas from masa harina are really good, so unless you find them totally inferior to the tortillas of your memory, I'd forget about the fresh masa. There's a lot of good Mexican food in Seattle. What part of town are you in and what are you looking for?