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Amazon [amazon.com] has Duck Brand 240867 MAX Strength Duct Tape, 1.88 Inches by 35 Yards, Black, Single Roll for $ 2.90 or less, when you checkout via Subscribe & Save.
Duck Brand 240867 MAX Strength Duct Tape, 1.88 Inches by 35 Yards, Black, Single Roll $2.90 or less S&S + FS