CompAndSave offers the Brother LC75 XL-Compatible Inkjet Cartridge 10-Pack for $34.90. Coupon code "SLICK75" makes it $4.90. With $3.99 for shipping, that's the lowest total price we could find for this quantity by $5. (Meanwhile, ShopAt247 via Amazon charges just pennies more for Prime members.) It includes four black cartridges and two cartridges each in cyan, magenta, and yellow.