Amazon.com: DoorStepInk Remanufactured in The USA Ink Cartridge Replacements for HP 27 & 28 (Combo Pack 1 Black & 1 Color Cartridge) for HP Printers DeskJet 3320, 3322, 3420, 3425, 3450 : Office Products
Compatible HP 56 Black Ink Cartridge (C6656AE) - Ink Station