These HP compatible ink cartridges for the HP Deskjet 3420 are backed by a quality and satisfaction Guarantee! Quality inkjet cartridge replacements and best value for your HP Deskjet 3420. Why buy an original ink cartridge for your HP Deskjet 3420 when you can get perfect quality out of a brand new generic inkjet cartridge at a fraction of the cost? We guarantee that they will print with the same high quality as your genuine HP brand cartridges or your money back! We also offer other discount HP Deskjet 3420 printer supplies as shown below.