A topic close to my heart. I worked for over two years at a rural yerba mate cooperative in Paraguay. In my biased opinion, Paraguayan yerba is by far the best and most flavorful yerba available. And it's available (as far as I have found) at these sites: The Pajarito brand at www.yerbamate.net The La Rubia brand (packaged under private label) at www.ymrev.com Also, check out the aromatic palo santo guampas and cool bombillas available at: www.latinogift.com I'd be happy to answer other questions, too, because I do have a lot of arcane knowledge in this area (and virtually no one to share it with!).