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The next time you shop at Costco, get a little nosy and peer into other shoppers’ carts. The one item you’re likely to see in almost everyone’s basket is the astonishingly cheap, yet plump and juicy, rotisserie chicken. Costco’s rotisserie chicken may not be as legendary as its $1.50 hot dog-and-soda-combo, but it comes close. It can be eaten plain, sliced for sandwiches, shredded for tacos…