AC Power Supply Adapter & Cord for HP DeskJet 6840 6940 6943 6980 6983 Charger | eBay
4 Original HP Ink 2 x 339 + 344 Deskjet 5940 6540 6840 6980 9800 Set/New | eBay
HP DeskJet 6840 review: HP DeskJet 6840 - CNET
HP Deskjet 6840 Maintenance - iFixit Repair Guide
HP 339 Ink 21ml black DJ5740 6540 6840 PSC2610 2710 PS8150 8450 (ML) - Multitronic
Amazon.com: DoorStepInk Remanufactured Ink in The USA Cartridge Replacements for HP 97 1 Color C9363 for HP DeskJet Series: 5740, 5940, 6520, 6540, 6620, 6830v, 6840, 6940, 6980, 9800 : Office Products
Amazon.com: SHUPAN 96/97 Ink Cartridge Combo Pack Remanufactured Ink Cartridge Replacement for HP 96 97 for HP Deskjet 5940 6940 6840 Officejet 7210 7310 Photosmart 2610 2710 Printer (1 Black 1 Tri-Color) : Office Products
3.2 Buttons and lights - HP Deskjet 6840 Printer series
AC Power Supply Adapter & Cord For HP DeskJet 6840 6940 6943 6980 6983 6988 | eBay
HP Deskjet 6840 Color Inkjet Printer - Review 2005 - PCMag UK
HP Deskjet 6840 Maintenance - iFixit Repair Guide
Amazon.com: ColoWorld Remanufactured 97 Ink Cartridge Replacement for HP 97 97XL HP97 Fit for HP OfficeJet 100 150 H470 7410 DeskJet 6940 6988 9800 6540 6840 PhotoSmart 2610 335 375 8150 8450 Printer (1 Color) : Office Products