While colour inkjet printers are a modern marvel boasting near photo quality output and a rapidly dropping price point, the actual cartridges that hold the ink that makes the prints seem disproportionately expensive.
For example, a respectable Hewlett Packard ink jet printer in the $100 - $200 range includes a black ink cartridge that costs some $20 - $40 to replace; the multi colour cartridge, another $30 or $40 or more. Fortunately, Klee Inc. offers Printon Refill Kits at the same price or less--and they're are good for two refills per kit; a 50% savings or better, depending on printer model.
The unnatural refill process of cracking and syringe-injecting new ink does take some care, patience a small bit of motor skill, but it's an uncomplicated procedure that only takes a few moments to accomplish.