skirt steak (arrachera) at my local mexican carniceria/fruteria is about $3.69/lb, usda choice. not a fantastic price (given the neighborhood, where it can be found for $2.50/lb or less regularly), but wonderful meat and very convenient, nonetheless.
the butcher took a full-sized skirt steak, trimmed much of the excess fat, and then butterflied into a 3-panel hunk of meat, about 9" wide and a good 3 feet long, or more, and about 3.6 pounds trimmed. he then ran it through the machine.
we divided it into 6ths, sprinkled each with salt/pepper/olive oil and grilled them very quickly over a hot lump charcoal fire, let them rest, and then snipped them into bite sized pieces, served them with el milagro corn tortillas, salsa verde and homemade chimichurri, and various fixin's.
it was heaven. juicy, flavorful meat, and not at all tough or stringy. skirt steak is my favorite "everyday" cut of beef. prime isn't necessary or even an option, it's intensely flavorful, and, cooked right, has one of my favorite textures.
mmm, now I'm hungry. bah.
-ed