I'm sure Jusers have written before about the atrocious cost of printer cartridges. I noted a new HP advert the other day that 'pushed' their ink, comparing it to car buying. "HP. Very reliable.No previous owners." The ad goes on to say: " A new original HP inkjet cartridge is guaranteed to be exactly that: new. Re-filled cartidges may have been around the block again and again, using the same print head. How many times? No one knows. More importantly, you don't. So, for reliable trouble f...