I recently purchased two ink cartridges from InkTonerStore (ITS) for my old HP Photosmart C5280 printer. I have not been able to find the requisite ink cartridges for this printer (an HP 74 black, or HP 75 color,) or the XL (for larger size) complements. Hewlett Packard apparently is no longer making them. But further HP has somehow managed to get software into these old printers that makes them not work very long with refilled cartridges. HOWEVER, InkTonerStore-com cartridges are working! I have not had them in long enough to discover if they work to the empty stage, but so far I am delighted, not having been able to find them anywhere else. AND, I was delighted with the quickness of service. THANKS guys!