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Must just be the trimmed up flat for that much. The whole packers usually run $2.50-$3.99 depending on the season. And their beef is prime so that plays a factor too
Our Costco usually only carries flats and their expensive. I'm not sure of the price but I believe it's in the $4.00 range. I'll have to check again next time I go.
I go the the Costco business center in Hayward Ca. $3.09 for prime and $2.69 for choice. They also had flats spiced for pastrami for under $5/lb today. I bought beef short ribs, pork ribs and a pork belly today.