Frigo String Cheese:
Costco $9.49/60ct that is $.16 each piece
WinCo Foods $4.36/16 that is $.27 each piece
so if you purchased 60 at WinCo at $.27 that would be: $16.20 at WinCo vs $9.49 at Costco; you save $6.71 at Costco!
Yes, sometimes you can use your coupons, doublers, or purchase them when they on sale and pick it up cheaper, but if you are purchasing them at regular price Costco is the winner.
*I hope I had all my math right*