Yes they do
They do
Yes, nice assortment.
Yes
Yes, they have sets and singles, and more on Costco.com
Costco sells about 20 to 25 various sized cookware sets, predominately Calphalon, Circulon, and their own brand Kirkland Signature. To get a better idea, check Costco.com online.
I have definitely seen sets being sold, but there are also probably singles being sold.
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