I buy Laura's Lean Beef (
www.laurasleanbeef.com) at my local supermarket. Their cattle are raised without any antibiotics or growth hormones and their brochure states that they are fed "a vegetarian diet of natural grasses and grains, they are never fed animal by-products. The feed is tested for pesticides and we have strict standards for humane treatment."
It costs a bit more than the regular lean hamburger meat but goes on sale every now and then, which is when I buy several pounds and make into patties for the freezer.
I like that they are lean, 8% fat, and they taste fine to me.