Had thought about getting the replacement cartridge from a well known auction site, but in the end chose Amazon as the price was right. The cartridge arrived very quickly and was fitted to the printer without any fuss. Take out the old one, remove the orange tab from the new one, drop in place, close the printer up. 2 minutes max. I then used the original box with a label supplied, to send the spent cartridge to HP, at no cost, as part of HP's recycling programme. Very straightforward. Will do the same for the colours when they run out.