I loathe the high cost of printer cartridges. Usually I can refill them and save a lot of money. However my HP 940C printer started flashing an error code indicating that I had to change the print cartridge. No matter what, even after refilling the cartridge, resetting the printer etc. it still wouldn't work. It still kept flashing so I went to get another print cartridge.
The print cartidge was $55. Wow, I was getting fed up with HP and thought maybe I should try an Epson printer. However I read that Epson is rigging their cartridges with circuitry that won't allow you to refill them. So for $99 I got another HP printer that has two full cartridges and prints better than my old printer. It would have cost $99 just to buy a new color and B&W cartridge.