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Amazon [amazon.com] has 3-Pack Revlon ColorSilk Permanent Hair Color Dye (Black) on sale for $ 5.79 ($ 1.93 each). Shipping is free w/ Prime or on $ 35+.
3-Pack Revlon ColorSilk Permanent Hair Color Dye (Black) $5.79 + Free Shipping w/ Prime or on $35+