Meritline offers four Brother LC75-Compatible Inkjet Cartridge 4-Packs (16 cartridges total) for $18.95. (Select 4 Sets under "Buy More Save More".) Coupon code "MLCF24DN" cuts them to $12.95. With free shipping, that's 81 cents per cartridge and the lowest total price we could find by $6. (For further comparison, we saw two 2-packs for $6 with free shipping in August.) It includes four each of black, cyan, magenta, and yellow cartridges.