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I did see the prime whole ribeyes at Costco Saturday for $9.99lb but I didn't pick any up. I've been shopping at Costco since they first came to the Atlanta area and for me I have to say their meat is pretty much hit or miss. I have bought steaks there that have absolutely been horrible and some that have been great. Honestly, I just don't trust their grade too much.
The last time I bought steaks there was about a year ago when they had whole ribeyes labeled as brisket for $2.79lb! I pointed it out to the butcher and he kinda just shrugged his shoulders and said, "good day for you". I bought all six whole ribeyes. I kept two, and sold the other for to neighbors for what I paid for them. Was a great deal, but some of the steaks I cut from it are just not that good and it was choice.