What’s the best way to buy ethically raised animal products?

I’m not vegetarian or vegan, but I am against animal cruelty and try to be as conscious of this when buying meat, eggs, and dairy. I don’t believe killing animals or harvesting milk/eggs is wrong, but I want to be sure that the animals are raised in a good environment. Anyway, what’s the best way to make sure that the animal products I buy come from ethically treated animals? I’ve often heard that “grass fed” beef and “free range” eggs are often still raised in factory farms; they just give the cattle breads or hay to eat, or the chickens are just not cooped up but still raised in cluttered conditions.

Is there a way to ensure that these animals were raised outdoors on a traditional farm? I’ve been trying to shop at a farmers’ market lately, so are most farmers’ market farmers owners of traditional farms, or are they often factory farm owners as well?