Tip - Printer ink is expensive; but will you save money with refills?

Printer ink isn't cheap, and if you compare prices by volume, you may find it's more expensive than almost any other liquid (including human blood). But that comparison may be misleading, since printer ink has to be almost magical in its ability to be a stable liquid for a long time, then be raised to 300 degrees Celsius and shot out of a microscopically small nozzle at 30 miles an hour and still hit the page as a perfect round dot. So you may want to spend extra to buy new inkjet cartridges.