Here are some websites we think might be useful.
We do not currently endorse any businesses (but we do discuss them in more detail on our Education page):
KOL Foods, a purveyor of grass-fed meat, among other animal products, including kosher back-halves. www.kolfoods.com
Grow and Behold, a purveyor of grass-fed, grain-finished meat, as well as pastured chickens. Brooklyn-based. www.growandbehold.com
Hazon, a Jewish environmental advocacy, community building and thought group, has a sustainable kosher meat page which has a collection of facts, articles, vendors and more resources