Costco changed their brand of Organic beef. It is now Kirkland Signature brand. I found the the source to be Verde Farms. On their website they say:
< Verde Farms was conceived at an estancia, or ranch, in the pampas while living in Argentina. Watching the cows roam in the open countryside, I rode alongside a gaucho on horseback experiencing a world so different than my life in the States. After the ride, when we sat down to eat a traditional meal of beef, red wine, more beef, and more wine, I realized that not only did the cattle grazing on the open pasture create a picturesque setting but it also resulted in scrumptious, flavorful beef.
My interest had been piqued. Upon returning to the States, I began to educate myself about the cattle industry in the US. Unfortunately, the more I learned, the more dismayed I became about the conditions in which the majority of the cattle were raised. Cattle, after a quick stint on the open-range, are quickly relocated into massive feedlots of 50,000-100,000 cattle. Rushed from birth to slaughter in factory-based feedlot systems using government-subsidized corn, pesticides, artificial fertilizers, growth hormones, and antibiotics results in cheap, mass-produced fatty meat that has little inherent flavor. There had to be consumers, like myself, who demanded better. Fortunately, the stars of the Southern Hemisphere aligned. My familiarity with South America and my passion for food soon intersected, and I launched Verde Farms, the premiere brand of free-range organic beef.
Verde Farm's commitment to organic, grass-fed beef on a global basis has created the opportunity for American consumers to eat a great-tasting product while also supporting small farmers domestically and from developing economies. When you purchase a product from Verde Farms, you are directly supporting a traditional way of life that has existed for generations and that, with your support, will continue to thrive.
So, go ahead, treat yourself to a great meal and make a world of difference.> Blockquote
Yes, Verde Farms provides the raw material for the Kirkland Signature organic ground beef sold at Costco.