I have about 100 assorted ink cartridges and got on Planet Green's website. I'm thankful that it is informative and has prices, and wished they would put the model #'s in order to make it easier to find. The vast majority of cartridges are $.05, or $.25 at the most. By the time you box up and deal with all the hassles, why wouldnt anyone get the store credit at Staples (assuming there is one nearby). Just about everyone uses office supplies or other stuff they sell there. $5-$15 or $200 credit? Its a no brainer.