HP DeskJet 840c Ink Cartridges - HP 840c Ink from $13.99
HP - Deskjet - Deskjet 840C - HouseOfToners | Houseoftoners.com
HP Deskjet 840C Ink Cartridges
Amazon.com: LD Products Remanufactured Compatible Replacement for Used in HP-23 HP23 HP 23 Color Ink Cartridge C1823D (Tri-Color, Single Pack) Colored/Clarity Vibrant and Long-Lasting Ink Formula : Office Products