Mexicans in the Carniceria might actually grind it fresh for you as you watch
If I could find a carniceria that came well-recommended by someone I know and trust, that looked decent enough from the outside to actually feel like I wasn’t taking a risk entering, I’d try that. The ones I’ve seen here thus far look sort of disreputable and fly-by-night. Best deals to be had on beef in my area come from local cattle farms. You’re pretty much looking at a side of beef and need a large freezer to work with that. Grass-fed though and comparatively reasonable on cost.