For its newsletter subscribers only, EverydaySource offers the Brother LC-61 Compatible Ink Cartridge 4-Pack for $15.99. Coupon code "S0902BQZP" cuts it to $6.99. With free shipping, that's the lowest total price we could find by $4. This set includes one black, one cyan, one yellow, and one magenta cartridge. Coupon expires after 1,000 uses.