With the amount of printing I do I go through ink fast. I've tried many different places for getting cheap ink and lets just say with most of them you get less that what you paid for. The best ink place I have found so far is Clickinks.com. You can get bot factory ink and refurb ink. Orders of $30 or more ship free and when you buy two of the same ink you will get a third free. They are super speedy at shipping and I have yet to have a problem with the product. Through 5-15 you can get 15% off by using code EARTHDAY.
This is a completely unpaid post. I just like Clickinks :)