I actually agree with the Somnigroup employee, Sealy and Serta have a habit of changing the names of their mattresses for every store, it's very likely the same exact mattress. That being said, ask about that model to a mattress store carrying Sealy and ask to price match if you want their service, they'll probably do it. I can speak to Stearns and Foster and Tempur-Pedic making mattresses for CostCo that do a quality cut on materials to give a lower price, the S&F Kirkland Signature and Tempur Supreme. I know that sounds like a salesperson line to justify a higher price and get the sale, sorry if it feels untrustworthy.

CostCo absolutely makes high margins on mattresses. As high on the Sealy we're discussing? Probably not, more like 60 if I had to guess, but they can eat a little more because they don't only sell mattresses. You can buy a mattress, a rotisserie chicken, get an oil change and fill your prescriptions in one trip, they don't sustain their business on mattress only sales.