I don't think CAFO beef will strike you dead but the good stuff isn't prohibitive either. At the very least look for no-hormone no-antibiotic beef from a single supplier that you can google. Grass-finished is nice but not mandatory. Rest assured nearly anything you get from a supermarket will be at least one notch up from whatever gets sold to chain restaurants and makers of canned soups, frozen dinners, etc.
The $20/lb. steaks definitely cause some sticker shock. I buy lots of fatty ground beef, shoulders, rumps, and occasional short ribs. A little braising and slow roasting can save a lot of cash and it's no less tasty, plus the leftover fat and bones are useful.
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starch fruits, vegetables, meat fat, dairy fat, oil fruits
Some: cured meat, dairy protein, sweet fruits, rice, pulses, tree nuts, oil seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, refined oils, peanuts