I don't think it's possible to buy any kind of food that has been treated in a way you can feel morally comfortable with at the majority of traditional grocery stores. Whether it's chocolate being created from cocoa beans farmed with slave labor in other countries, apples getting picked by undocumented workers making less than minimum wage on farms, or frozen foods getting packaged at factories with questionable working conditions. Unless you straight up build your own garden and farm off the grid and do everything yourself your only option is to either feel morally queezy 24/7 or live your best life and maybe donate a couple hundred each month to organizations like The Humane Society that work to improve conditions for you.
I think you hit it on the head with "the majority of traditional grocery stores." For me those just aren't the place to shop for animal products like meat and dairy. Hit the specialty places for that, pay the premium, and eat less of it. Maybe this one study debunks all the rest of the data out there about red meat, maybe not, but it's a healthy lifestyle that works for me; I only pay to eat meat once or twice a month as a result.
There's one other source of good meat: hunting. I suck at that but I have friends and associates who hunt and they are often trying to get rid of extra meat. Always happy to help with that :)
