Invest in a crockpot. Buy crappy cuts of grassfed meat (usually the tough parts) and cook them in the crockpot until tender. My favorite is to make a curry with coconut milk and curry paste and just toss in a hunk of meat. Forget about it for a couple of hours and then eat! That said, grassfed meat is still crazy expensive, regardless of what cut you buy. I could never afford it when I was in school.