With all of the printing going on in our homeschool, we're always looking for affordable places to buy ink! I normally get mine on Amazon, but I'm curious if you have found better prices somewhere else! More on community.confessionsofahomeschooler.com

Walmart's own website is filled with numerous negative reviews on these "Great Value" cartridges, people saying multiple error messages and the cartridges don't work properly etc. This may be in-part due to the fact that HP has a history of releasing firmware/driver updates that block the use of non-OEM ink cartridges. The good news is that HP Instant Ink is fast, cheap and allows you to save significantly vs. buying ink at retail: 50 pages/month plan currently runs $2.99/month or $36/year which is very close to the cost of a single set of replacement ink cartridges. For this you get 50 pages per month, and up to 50 unused pages rollover to subsequent months. Extra pages cost only pennies per page. New ink cartridges come in the mail, you return your old ones in the same box for recycling - postage paid. Any replacement cartridges that you might need while enrolled are fully covered. No worries about wasting ink on purge/cleaning cycles, etc - you ONLY pay for actual printed pages. Your printer automatically communicates with HP and you receive replacement cartridges before you run out. All you pay is a flat monthly price based on the number of pages you print, regardless of how many cartridges you need. http://www8.hp.com/us/en/instant-ink/overview.html More on reddit.com

Translation: There's perfectly good ink in this cartridge, but we won't let you use it. EDIT: The corporate suits would alter the above to read "You are not licensed to use it." The problem here is that when I buy something, it is mine to do with as I wish, with reasonable restrictions, for example, not using a baseball bat to bash in someone else's windows. But whether I want to use my shiny new baseball bat to play baseball, or to go out in my backyard and destroy my own HP printer, it is purely my choice. More on reddit.com

If just the box is opened I take them back but if the foil is opened I dont because really anyone can put an old cartridge in there More on reddit.com