The HP ENVY Pro 6455’s cost-per-print is disappointing. Due to the extremely low page yield, you need to buy new cartridges regularly if you print a lot, and even though they’re cheap, costs add up quickly over time. You can sign up for HP’s Instant Ink subscription, which automatically sends you new cartridges when you run out.
Even if you print only in black, most inkjet printers continue using the color cartridges for servicing tasks, so you’ll likely still need to replace them eventually.