Ink Jet Ink Now $8,000 a Gallon I just saw $3.99 on a gas station pricing sign this weekend, and you know it’s not going to get any lower. Being an optimist, I decided to see what other fluids are even more pricey than light sweet crude. Turns out – Ink Jet ink has now reached an unbelievable $8,000 a gallon.We’ve covered this before, but let’s do some more math. HP is reporting that over 40% of its $2.63 billion in operating profits last quarter came from it printer business. Ink jet ink used to cost more by the ounce than Dom Perignon (still does,) but whatever way you measure it, people keep snapping up cartridges and filling up those thirsty, thirsty little printers.