Hey, here's a great link on re-fill carts if you would like to go that way. These are the ones I will get when I go that route, Melissa absolutely loves hers. She does a great job laying out the info on price and suppliers.
We spend alot of time researching this issue, I've been there. After watching this progress, I'm convinced she went the right route, so I'm passing on this link to hopefully cut through the muddle and get you where you want to be. Like I said, I haven't gone here yet, but Melissa is great, and you can write to her directly with any Q's. Here you go:
Epson Dura-Brite Inks
Best regards.
PS: refill carts save money for folks who don't print enough to justify the expense of cis. For heavy volume printing, CIS is great, but I hear there can be clogging problems if not printing frequently.