Save money by refilling your own printer cartridges. I found that refilling ink cartridges is very simple and will save a ton of money! I ordered a refill kit from inksell.com and it came with everything to do the job. The kit cost $12, and was good for 4 refills. I didn't spill a drop, and customer service is excellent with the company.
I know that refilling your own cartridges is cheaper, but doing so may void your warranty. Check your warranty to make sure you aren't going to end having to buy a new machine if the ink does any damage. If you pay for service on your printers (e.g. a company machine) then you may be voiding the service contract as well. Too many of the refill systems end up damging the machiens and printheads, so lots of companies now will include coverage for this kind of damage in their warranty.
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Buying a new ink cartridge is expensive, especially if you have a lot to print or you're printing out photos. Recently I've noticed that I can't even print out 100 black and white pages before I need to change my ink cartridge.