Meritline offers two Canon-Compatible PGI-225 / CLI-226 Inkjet Cartridge 5-Packs (10 cartridges total) for $19.95. (Find this option under "Buy More Save More".) Coupon code "MLCY11UN" cuts it to $8.95. With free shipping, that's the lowest total price we could find for this quantity of such items by $1. (For further comparison we saw a 12-pack in January for $13 total.) Each 5-pack contains a pigment black, black, cyan, magenta, and yellow cartridge. These cartridges fit several types of Canon PIXMA printers; see the "Compatibility" list on the product page for a list.