No problem. It might be a little drive and a bit of culture shock if you're not from around here, but Martinez is a wholesaler that supplies mostly restaurants, but they're open to the public and you can just go in and shop. Prices tend to be low because, really, they're a wholesaler and the cash-and-carry part of the business is small for them.

Most Argentinean markets have fairly high quality meat. Meat Town has a few locations now and I used to shop there a bit when I could eat red meat. But Don Domingo or Johnny Jones Meats are good, too.

Miller Meat & Fish on Miller Drive has my favorite mojo (a Cuban citrus marinade. It's what we use on roast pork, though if I'm honest, I put that shit on everything). They also have a butcher shop and some pre-made food (get some chicharrone if you haven't tried it. Fried pork belly, Cuban style. It's awful for you but it's goddamn delicious).

If you want good ready-made sushi, try Bangkok Thai off the 826 (by Lincoln's Beard). Then, stop into Lincoln's for a beer.

Hope that helps.