Costco has some incredible sirloins packed in bulk packs. They have choice and prime. The prime is only $1 more a lb. I think it is $8, but they are the most tender sirloins I have ever had. They are about 2.5" think and each steak is about 12-16oz. I use them for a bunch of our red meat needs. But we even enjoy them just as steaks. I sear each of them for 1.5min on each side w/ butter in a cast iron pan, and then put them on a tray w/ meat thermometer into a 275 oven and cook until 115. I get no arguments from the kids or wife, and normally they only want fillet
But I have not seen a place with as good quality of meat at consistently good pricing as costo. We have a higher end chain store here as well, that will often run 'loss leader' meat sales and I stock up when they do good sales as well.