Necia D.
Yelp
While Seattle's not entirely destitute when it comes to Latin markets, you do tend to have to drive to lurkier parts of town (look for hourly hotels) or outskirts (where all the baristas are wearing pasties, for example) to get your salsa on; and even then, you'll be getting straight-up Central American items, not likely Brazilian, Argentinean, or Colombian treats.
Not so with this place. Hands down the best place in town to buy yerba mate, and so very much cheaper. It's the real deal--the same stuff I sucked up in Argentina when I was a sixteen-year-old exchange student trapped in a 4'5" host sister's Catholic school uniform (the aforementioned bikini baristas had nothing on me...except perhaps more confidence).
Even yerba mate soda can be found here, and the Guarana (a type of super-speed-like soda) they served on the late great Varig, the sweetest airline I ever had the pleasure of riding on. Sigh. Nostalgia.
Pick up your aji piquillo, Peruvian salsas, coconut waters and Mexican chocolate. Grab a big-ass hanging dried chile bunch, grind it up with one of their mortar-and-pestles, and you'll be set with spicy for the next decade.
Even if you didn't need an excuse to get so close to Cafe Campagne that it's almost an affront not to eat breakfast there, this place is absolutely destination-worthy. I love it to bits, even though at the moment, due to some retrofitting or construction or general goings-on with loud tools, it's been relegated to some chilly (not to be confused with Chile!) blue portable building across from its normal domicile. This place completes me.