I paid 5 Euros for a HP 4050N from a bankrupt bank back in 2008. I still have not changed the cartridge 13 years later! I am starting to get worried that all

I paid 5 Euros for a HP 4050N from a bankrupt bank back in 2008. I still have not changed the cartridge 13 years later! I am starting to get worried that all the cartridge refill shops will go out of business before I get a chance to do a refill.