I have an HP all in one. It has the instant ink program. Your set it up online. It came with ink and it monitors your levels and when you get low it auto sends an ink cartridge. Best investment ever! There are different plans depending on how much you print. I am on the 4$monthly for 100 pages and they roll over if you don’t use them. They send the ink before you are out. I never wait. Even if I buy refurbished ink its still cheaper.
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I have an HP envy 5400 and I love it. We’ve had it for almost 3 years.
Edited to add: It’s actually an Envy 5540 series not 5400
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That sounds awesome!! Your printer helps you out! I always run out of ink and takes my lazy butt forever to refill it! 
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