Now you're talking!! Sounds like good news, homeinbuenosaires! I'm back in the US for 6 weeks (eating grass fed beef from Whole Foods), but Aleina Dee and I have continued discussing this, and are looking for resources. Great that your guy is passionate about organic food and wary about "bad grass".
Do you have an email address for Eduardo? I have found a his Facebook page, at least.
By the way, I was getting pastured eggs and organic poultry delivered weekly with my organic produce by El Rincon Organico. The chicken parts were beautiful and delicious. Eggs particularly good, too.