If you want Canon or Epson Ink, you can get black for less than $3.00, and color for less than $5.00 at
Great cheap ink
Order 10 or more (mixing is o.k.) and shipping is free, otherwise $3.95 per order.
Come in full retail cardboard packages, and with foil and same yellow peel of strip's like Epson has.
First saw them on e8ay with something like 3000+ positives and only 2 negatives, and now just go right to there web site. These are not refills, but are generic. No problem in Epson 600 and 860, (or apparently with the 3000+ e8ayers).