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Amazon [amazon.com] and Target [target.com] have 11" x 17" GoodCook Nonstick Steel Baking Sheet on sale for $ 4.49. Shipping is free w/ Prime / RedCard or $ 35+.
11″ x 17″ GoodCook Nonstick Steel Baking Sheet $4.49 + Free S&H w/ Prime / RedCard or $35+