I have a HP LaserJet printer than ran off the initial toner cartridge for something like ten years. I reckon I don't print as much as you do, but I was impressed.
Do you know the model? And is it monochrome or color?
Came here to say this, literally any Laserjet printer, I had to research it before for a business plan. Just do research on the best Color Laserjet printer (they come in both color and monochrome).