On my last couple of trips to Costco, I noticed that they had prime rib eyes and prime NY strips in a separate case. I have never bought prime "anything" at a grocery store because I have never seen it before anywhere. Last night I decided to splurge. I bought two rib eyes just to see if I could tell the difference. They were EXCELLENT. They were also so rich that two were really enough for four of us. They were also cut a little thicker but I watch them like a hawk on the grill. Nothing worse than over cooked rib eye.