A full refill for my HP 8725 seems to be £158! The previous identical cartridges cost £85, and that was an insult. This is getting beyond ridiculous. It's not

A full refill for my HP 8725 seems to be £158! The previous identical cartridges cost £85, and that was an insult. This is getting beyond ridiculous. It's not like printer tech has improved much in recent years. I suspect a lot of what they're charging me for is R&D into how to prevent customers from using 3rd-party cartridges and a big profit hike to congratulate themselves for doing so successfully.