Recently I heard part of a podcast in which the host (I think #CoryDoctorow ) mentioned that the cost (by volume) of ink for inkjet printers is more than the semen of winning racehorses.
Though my opinion of inkjet printers has been poor from their start, about 35 years ago I bought a small Epson model for practically nothing at a surplus store (HSC Electronics, then probably still called Halted Specialties Company, after its founders Hal and Ted). I found that I could fill the reservoir in its print head with fountain pen ink via a syringe with a hypodermic needle. I recall sometimes carrying it in a bag and at my university printing letters that I had written using my #AtariPortfolio palmtop computer. (It also fit in my jacket pocket, ran code that I could write and compile on a PC with Borland software, and ran on 3 AA batteries!)