iFreeMall via Amazon offers the Office World Canon Pixma-Compatible Ink Cartridge 18-Pack for $16.99. Coupon code "5C3W3RL6" cuts that to $11.89. Plus, Prime members bag free shipping. That's $11 off list and the lowest price we could find. It includes six large black cartridges, and three small cartridges each of black, cyan, yellow, and magenta. Compatible printer models are listed on the product page. Deal ends November 30.