It's complicated... grain, hops, yeast all come from abroad. However, starfruit, oranges, coconuts, crazy spices, herbs and fruits I've never heard of come from here. If you like chucking interesting things into the brew kettle, this is the place.
Grain is a huge PITA to import and the shipping is expensive. At this point I have to order through others. In 2009, the only operating microbrewery folded, and with it went our source of grain. Fortunately for us we were able to purchase remainders of their grain and in an even more fortuitous turn of events, the brewer of the long awaited Volcano Brewery in Tilaran has been found and we've just added-on to their grain order. They should open their 3HL brew-pub in a couple months.
Hops and yeast are easy enough to bring down on the plane.
I'm happy to supply any homebrewers/brewers in Costa Rica with grain as I can spare it. I'm primarily using a mix of manufacturers, mainly US 2-row, Carmel 20L, Carmel 40L, Carmel 120L.
I also may or may not have a custom built pump-driven 15-gal pilot system for sale from the recently closed K&S Brewery in Cartago (trying to up our system to 40 gal). Anyway, anyone in CR interested in brewing in general I'd love to talk to. We are in Malpais.