TonerDeal via Amazon still offers a Canon-Compatible PGI-225 / CLI-226 Inkjet Cartridge 10-Pack
for shipping. Outside the price below, that's the lowest total price we could find by $4, although we saw this quantity for $1 less in November. These cartridges fit several types of Canon PIXMA printers.
A close price: Meritline
has a similar 10-pack (two 5-packs) for $14.95 via coupon code "MLCR26TN", $7.95 after, with free shipping.