Meritline offers this Canon BCI-6-Compatible Inkjet Cartridge 3-Pack (18 cartridges total), bundled with 20 sheets of photo paper for $18.95. (It's the first option under "Buy More Save More".) Coupon code "MLCS07BN" cuts it to $13.95. With free shipping, that's the lowest total price we could find for the ink alone in this quantity by $9, although we saw it for a buck cheaper last month. It's compatible with Canon i9950, i9900, and i900D printers, among others.