Don't. You need to have all colour ink cartridges even if you only print B&W, and if you don't print often, you will need to replace the cartridges after some time anyway. I don't know if that's because the ink dries out or if they have some artificial time limit, but I had to replace all cartridges every half year or so while I think I printed only a few dozen pages in that time, almost all black & white.

I replaced it with a €140 Brother B&W laser printer/scanner a year or two ago and have been happy with it ever since. Sad to hear they turned evil too.