A Little Pricey, but Worth it: Brother Toner TN-210 Cartridge Set, 4-Pack, Black, Cyan, Magenta, and Yellow

Buying them as a set of 4 saves a few bucks over buying singly. Official Brother laser ink drums. Includes a set of four, one drum for each color. Arrived promptly. They are still significantly more than the off-brand or refilled versions, but over the length of time you probably use a set.

The first few pages were a bit light, but now the Toner TN-210 Cartridge Set perform better than the originals that came with the unit. Cartridges are super easy to install and colors are vivid. Time will tell if I actually get the 1400 copies stated on the package, but if not, there's a way to extend cartridge life. Just Google the Brother printer model and add "toner override" then scroll down the forum for instructions.