HAH! I haven't purchased refill cartridges for inkjet printers in years. By the time you're done paying for the bloody thing, you could have bought a cheap printer on sale for less money. So for me, if the cartridge run out of ink, I just keep an eye out for a good printer sale. LOL
The price of cheap laser jets and cartridges is heading the same way too. This ridiculous state of affairs is clearly artificial and should be legislated against if common sense cannnot prevail. The first inkjet I bought many moons ago (a Canon BJ130 I think) cost over 100 pounds and the cartridges, whilst expensive at 15 pounds, at least bore a sensible relation to the original purchase cost of the machine. They contained a decent amount of ink too, and would print many pages, unlike today's cartridges!