I own a HP 4050N that I paid 5 euros at a bank bankrupcy in 2008. Still have not changed the cartridge (apparently it is good for 10k pages). I am starting to

I own a HP 4050N that I paid 5 euros at a bank bankrupcy in 2008. Still have not changed the cartridge (apparently it is good for 10k pages). I am starting to worry that all cartridge refill businesses will close before I need a refill..