Meritline offers the PGI-250XL / CLI-251XL Canon-Compatible Inkjet Cartridge 12-Pack with Chip for $26.95. (Choose "2 Sets" under "Buy More Save More".) Coupon code "MLCJ23EN" cuts it to $16.95. (161 online eStore via eBay charges pennies more.) With free shipping, that's the lowest total price we could find for this quantity by $13. These cartridges fit several types of Canon inkjet printers; use the compatibility chart on the product page to check specific models.